diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..31edd90
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+/.vscode
+/**/practice
+**.exe
diff --git a/Learn-CPP/Day-01/hello.cpp b/Learn-CPP/Day-01/hello.cpp
new file mode 100644
index 0000000..e9f3fbd
--- /dev/null
+++ b/Learn-CPP/Day-01/hello.cpp
@@ -0,0 +1,21 @@
+// Let's with the basics of CPP
+
+// Import a library 😁
+
+#include <iostream>   // It's precompiled code, which includes keywords, namespaces
+
+using namespace std;
+
+// Main function, it's better to write void as an argument
+// It makes program more readable
+int main(void){
+
+  // Print statement, outputs to the console
+  cout<<"Let's go with g++!!";
+  // return 0;   // Tells the os, that the program execution was succesfull
+}
+
+// g++ {programFileName}.cpp -o {outputFileName}.(out | exe)
+// Run the file
+//  ./{outputFile}        - Powershell / bash
+//  call {outputFile}     - On CMD
diff --git a/Learn-CPP/Day-01/hello.out b/Learn-CPP/Day-01/hello.out
new file mode 100644
index 0000000..7cfce11
Binary files /dev/null and b/Learn-CPP/Day-01/hello.out differ
diff --git a/Learn-CPP/Day-02/alias.cpp b/Learn-CPP/Day-02/alias.cpp
new file mode 100644
index 0000000..741bef7
--- /dev/null
+++ b/Learn-CPP/Day-02/alias.cpp
@@ -0,0 +1,26 @@
+#include<iostream>
+
+using namespace std;
+
+
+// Typedef is just like defining a new keyword with properties or behaviour of existing keyword
+typedef int rollno;     // rollno has properties of `int` now
+
+
+// enum is like defining a counter to the given set of items
+// By default this counter will start from 0, but we can specify the counter value for specific item, and others will have there counters updated
+enum working {mon=1, tue, wed, fri=5, sat, sun};
+//              1     2    3    5      6    7    
+
+int main(void){
+
+  rollno myRollNo = 46;     // myRollNo is of type `int` only, but this version of code is much more readable
+  cout<<"Size of 'myRollNo': "<<sizeof(myRollNo)<<endl<<endl;
+
+  // Value wed, will be 3, as it second after the mon(1)
+  cout<<"Value for wed: "<<working::wed<<endl;
+  cout<<"Value for sat: "<<working::sat<<endl;
+  // sat will be 6, as it comes just after fri(5)
+
+  return 0;
+}
diff --git a/Learn-CPP/Day-02/arithmetic.cpp b/Learn-CPP/Day-02/arithmetic.cpp
new file mode 100644
index 0000000..d0428ec
--- /dev/null
+++ b/Learn-CPP/Day-02/arithmetic.cpp
@@ -0,0 +1,31 @@
+#include<iostream>
+using namespace std;
+
+int main(void){
+
+  char a = 'a';
+  char b = 'b';
+
+  char c = a + b;
+
+  cout<<"Printing directly the sum: "<<a+b <<endl;    // Output is 195(97 + 98), as internally char are stored as integers(ASCII values)
+  cout<<"Printing variable declared as `char`: "<<c<<endl;      // Outputs ├ because `c` is declared as the `char`, so 195 is converted back to character
+
+  // Integers
+
+  int Int1 = 5;
+  int Int2 = 7;
+
+  int sum = Int1 + Int2;
+  int diff = Int1 - Int2;
+  int product = Int1 * Int2;
+  int remainder = Int1 % Int2;    // It's called a modulo operator
+
+  cout<<"Working with Integers";
+  cout<<"Sum: "<<sum<<endl;
+  cout<<"Diff: "<<diff<<endl;
+  cout<<"Product: "<<product<<endl;
+  cout<<"Remainder: "<<remainder<<endl;
+
+  return 0;
+}
diff --git a/Learn-CPP/Day-02/data_modifiers.cpp b/Learn-CPP/Day-02/data_modifiers.cpp
new file mode 100644
index 0000000..4e37b09
--- /dev/null
+++ b/Learn-CPP/Day-02/data_modifiers.cpp
@@ -0,0 +1,31 @@
+#include<iostream>
+
+using namespace std;
+
+int main(void){
+  /*
+
+  Primitive Data types: (int, char): Integral, bool, (float, double): Decimal
+  Data type    
+  signed        - Default one , one bit is reserved for the sign  
+  unsigned      - All bits are used, minimum number will be 0
+  short         - Almost half the size
+  long          - Almost double the size (depends on compiler)
+
+  */
+
+  int var = 5;
+  signed int svar = 6;
+  unsigned int uvar = 6;
+  short int shvar = 6;
+  long int lvar = 6;
+
+
+  cout<<"Size of int: "<<sizeof(var)<<endl;    // 4
+  cout<<"Size of signed int: "<<sizeof(svar)<<endl;   // 4
+  cout<<"Size of unsigned int: "<<sizeof(uvar)<<endl;   // 4
+  cout<<"Size of short int: "<<sizeof(shvar)<<endl;  // 2
+  cout<<"Size of long int: "<<sizeof(lvar)<<endl;   // 8
+
+  return 0;
+}
diff --git a/Learn-CPP/Day-02/uses.cpp b/Learn-CPP/Day-02/uses.cpp
new file mode 100644
index 0000000..a91adb0
--- /dev/null
+++ b/Learn-CPP/Day-02/uses.cpp
@@ -0,0 +1,12 @@
+// Uses of typedef
+#include <iostream>
+
+using namespace std;
+
+// Instead of writing long long int, now we have to write only ll, to define a long long int
+typedef long long int ll;
+
+int main(void){
+  ll myLongInt;
+  cout<<sizeof(ll);
+}
diff --git a/Learn-CPP/Day-02/variables.cpp b/Learn-CPP/Day-02/variables.cpp
new file mode 100644
index 0000000..ce4f146
--- /dev/null
+++ b/Learn-CPP/Day-02/variables.cpp
@@ -0,0 +1,11 @@
+#include<iostream>
+
+// Define namespace
+using namespace std;
+
+// Main function
+int main(void){
+  int a = 5;    // Declare a variable with integer data type
+  cout<<"Value of a: "<< a;    //output above integer
+  return 0;
+}
diff --git a/Learn-CPP/Day-03/advanced_conditionals.cpp b/Learn-CPP/Day-03/advanced_conditionals.cpp
new file mode 100644
index 0000000..d774f00
--- /dev/null
+++ b/Learn-CPP/Day-03/advanced_conditionals.cpp
@@ -0,0 +1,14 @@
+#include<iostream>
+
+using namespace std;
+
+int main(void){
+  // Comma(,) Operator returns last output
+  int a=5, b=6, c=7;
+  if(a<b, b>c){
+    cout<<"This is inside if statement";
+  }else{
+    cout<<"Though the first expression is true, else is getting processed...";
+  }
+  return 0;
+}
diff --git a/Learn-CPP/Day-03/menu.cpp b/Learn-CPP/Day-03/menu.cpp
new file mode 100644
index 0000000..c1f3298
--- /dev/null
+++ b/Learn-CPP/Day-03/menu.cpp
@@ -0,0 +1,32 @@
+#include<iostream>
+using namespace std;
+
+int main(void){
+  string time, name;
+  cout<<"Enter your name: ";
+  cin>>name;
+
+  cout<<"What's the section of the day now?(morning, afternoon, eve): ";
+  cin>>time;
+
+  switch(time){     // May throw, switch quantity is not integer, in CPP version<17
+    case "morning":
+      cout<<"Good morning "<<name<<". Did you have breakfast yet?\n";
+      break;
+    case "afternoon":
+      cout<<"Good afternoon "<<name<<". Did you have lunch yet?\n";
+      break;
+    case "eve":
+    case "evening":
+      cout<<"Good evening "<<name<<". Did you have evening yet?\n";
+      break;
+    case "night":
+      cout<<"Good night "<<name<<".🥱\n";
+      break;
+    
+    default:
+      cout<<"Well, maybe you're living in different dimension\a";
+  }
+
+  return 0;
+}
diff --git a/Learn-CPP/Day-03/relation.cpp b/Learn-CPP/Day-03/relation.cpp
new file mode 100644
index 0000000..eda1bee
--- /dev/null
+++ b/Learn-CPP/Day-03/relation.cpp
@@ -0,0 +1,42 @@
+// Let's start with Relational and Logical operators
+#include<iostream>
+
+using namespace std;
+
+int main(void){
+
+  /*
+  Relational Operators
+  >     : Greater than
+  <     : Less than
+  >=    : Greater than or equal to
+  <=    : Greater than or equal to
+  ==    : Is equal
+  !=    : Not equal
+  */
+
+  int a = 8, b = 7;
+
+  cout<<"a = 8\nb = 7\n";
+  cout<<"a > b: "<<(a>b);
+  cout<<"\na < b: "<<(a<b);
+  cout<<"\na >= b: "<<(a>=b);
+  cout<<"\na <= b: "<<(a<=b);
+  cout<<"\na == b: "<<(a==b);
+  cout<<"\na != b: "<<(a!=b);
+
+
+  /*
+  Logical Operators
+  &&    : AND
+  ||    : OR
+  !     : NOT   : Unary Operator
+  */
+
+  int c = 5;
+  cout<<"\n\na>b and a>c  (Is a greatest of them): "<<(a>b) && (a>c);
+  cout<<"\nb>c and b>a  (Is b greatest of them): "<<(b>c) && (b>a);
+  cout<<"\nc>a and c>b  (Is a greatest of them): "<<(c>a) && (c>b);
+
+  return 0;
+}
diff --git a/Learn-CPP/Day-03/switch_case.cpp b/Learn-CPP/Day-03/switch_case.cpp
new file mode 100644
index 0000000..f39b24e
--- /dev/null
+++ b/Learn-CPP/Day-03/switch_case.cpp
@@ -0,0 +1,25 @@
+#include<iostream>
+using namespace std;
+
+int main(void){
+  int choice;
+  cout<<"Enter your choice: ";
+  cin>>choice;
+
+  // Compare the value of `choice` variable
+  switch(choice){
+    case 0:
+      cout<<"Choice 0"<<endl;
+      break;
+    case 1:
+      cout<<"Choice 1"<<endl;
+      break;
+    case 2:
+      cout<<"Choice 2"<<endl;
+      break;
+    
+    default:
+      cout<<"Not defined case"<<endl;
+  }
+  return 0;
+}
diff --git a/Learn-CPP/Day-03/ternary_max.cpp b/Learn-CPP/Day-03/ternary_max.cpp
new file mode 100644
index 0000000..5799365
--- /dev/null
+++ b/Learn-CPP/Day-03/ternary_max.cpp
@@ -0,0 +1,16 @@
+// Find max of 3 numbers using ternary operators
+#include<iostream>
+using namespace std;
+
+int main(void){
+
+  int a, b, c, _MAX;
+  cout<<"Type in 3 integers: ";
+  cin>>a>>b>>c;
+
+  // Just use ternary operators to minimise the LOC (lines of code)
+  _MAX = (a>b && a>c)?a:(b>c?b:c);
+  cout<<"Maximum is: "<<_MAX;
+  
+  return 0;
+}
diff --git a/Learn-CPP/Day-04/factorial.cpp b/Learn-CPP/Day-04/factorial.cpp
new file mode 100644
index 0000000..6526e75
--- /dev/null
+++ b/Learn-CPP/Day-04/factorial.cpp
@@ -0,0 +1,14 @@
+#include<iostream>
+using namespace std;
+
+int main(void){
+  int n;
+  unsigned long long int fact=1;
+  cout<<"Enter n: ";
+  cin>>n;
+
+  for(int i=2; i<=n; i++) fact*=i;
+  cout<<fact;
+
+  return 0;
+}
diff --git a/Learn-CPP/Day-04/hw/detectPrime.cpp b/Learn-CPP/Day-04/hw/detectPrime.cpp
new file mode 100644
index 0000000..1050bc3
--- /dev/null
+++ b/Learn-CPP/Day-04/hw/detectPrime.cpp
@@ -0,0 +1,24 @@
+// Check if the number is prime
+#include<iostream>
+using namespace std;
+
+int main(void){
+  int num;
+  bool isPrime = true;
+
+  cout<<"Enter the number to check: ";
+  cin>>num;
+
+  
+  // Check till i*i<=num
+  for(int i=2; i<num/2+1; i++){
+    if(num%i==0){
+      isPrime = false;
+      break;
+    }
+  }
+
+  cout<<num<<" is a "<<(isPrime?"Prime":"Composite")<<" number...";
+
+  return 0;
+}
diff --git a/Learn-CPP/Day-04/hw/sumNatural.cpp b/Learn-CPP/Day-04/hw/sumNatural.cpp
new file mode 100644
index 0000000..0cbfda9
--- /dev/null
+++ b/Learn-CPP/Day-04/hw/sumNatural.cpp
@@ -0,0 +1,18 @@
+// Find the sum of n natural numbers
+#include<iostream>
+using namespace std;
+
+int main(void){
+  int n, _sum = 0;
+
+  cout<<"Enter the number: ";
+  cin>>n;
+
+  for(int i=1; i<=n; i++) _sum += i;
+
+  // Alternative: cout<<n*(n+1)/2;
+
+  cout<<"Sum of "<<n<<" natural numbers = "<<_sum;
+  
+  return 0;
+}
diff --git a/Learn-CPP/Day-04/intro_for.cpp b/Learn-CPP/Day-04/intro_for.cpp
new file mode 100644
index 0000000..4b46e01
--- /dev/null
+++ b/Learn-CPP/Day-04/intro_for.cpp
@@ -0,0 +1,10 @@
+// Introduction to for loop
+#include<iostream>
+using namespace std;
+
+int main(void){
+  
+  for(int i=1; i<10; i*=2) cout<<i<<" ";
+
+  return 0;
+}
diff --git a/Learn-CPP/Day-04/max_function.cpp b/Learn-CPP/Day-04/max_function.cpp
new file mode 100644
index 0000000..220efa4
--- /dev/null
+++ b/Learn-CPP/Day-04/max_function.cpp
@@ -0,0 +1,16 @@
+// Use of max function to get max of 3 variables
+#include<iostream>
+using namespace std;
+
+int main(void){
+  int a, b, c, _max;
+
+  cout<<"Type in 3 integers: ";
+  cin>>a>>b>>c;
+
+  // Only takes to arguments
+  _max = max(a, max(b, c));
+  cout<<"Greatest of these numbers: "<<_max;
+
+  return 0;
+}
diff --git a/Learn-CPP/Day-04/perfectNumEff.cpp b/Learn-CPP/Day-04/perfectNumEff.cpp
new file mode 100644
index 0000000..23fb917
--- /dev/null
+++ b/Learn-CPP/Day-04/perfectNumEff.cpp
@@ -0,0 +1,27 @@
+// Trying to find efficient algorithm to find if the number is a Perfect Number
+#include<iostream>
+#include<assert.h>
+using namespace std;
+
+typedef long int l;
+
+bool isPerfect(int num){
+  l sum = 1;
+  for (int i = 2; i < num/2; i++){
+    if(num%i == 0){
+      sum += i;
+      if(num/i >= num/2 && num/i != i){
+        sum += num/i;
+      }
+    }
+  }
+  return num==sum;
+}
+
+int main(void){
+  assert(isPerfect(6));
+  assert(isPerfect(28));
+  assert(isPerfect(496));
+  assert(!isPerfect(5));
+  cout<<"Yupp";
+}
diff --git a/Learn-CPP/Day-04/perfectNumber.cpp b/Learn-CPP/Day-04/perfectNumber.cpp
new file mode 100644
index 0000000..57a99cd
--- /dev/null
+++ b/Learn-CPP/Day-04/perfectNumber.cpp
@@ -0,0 +1,22 @@
+// Check if the number is a Perfect number
+
+#include<iostream>
+using namespace std;
+
+typedef long long int ll;
+
+int main(void){
+  ll sum=1, num;
+  cout<<"Enter the number: ";
+  cin>>num;
+
+  // Working, but time inefficient
+  for(int i=2; i<num; i++){
+    if(num%i == 0){
+      sum += i;
+    }
+  }
+  cout<<(sum == num && num!=1);
+
+  return 0;
+}
diff --git a/Learn-CPP/Day-04/que.cpp b/Learn-CPP/Day-04/que.cpp
new file mode 100644
index 0000000..e0664be
--- /dev/null
+++ b/Learn-CPP/Day-04/que.cpp
@@ -0,0 +1,12 @@
+#include<iostream>
+using namespace std;
+
+int main(void){
+  int n;
+  cout<<"Enter the base: ";
+  cin>>n;
+
+  for(int i=1; i<=10; ++i) cout<<n<<"*"<<i<<" = "<<n*i<<endl;
+
+  return 0;
+}
diff --git a/Learn-CPP/Day-04/simpleLoop.cpp b/Learn-CPP/Day-04/simpleLoop.cpp
new file mode 100644
index 0000000..30c5faf
--- /dev/null
+++ b/Learn-CPP/Day-04/simpleLoop.cpp
@@ -0,0 +1,14 @@
+// Get the better understanding of loop
+#include<iostream>
+using namespace std;
+
+int main(void){
+
+  int num = 1;
+  
+  // While loop executes till the condition specified is true
+  while(num<=5) cout<<num++<<" ";   // ++ is a unary operator
+
+  // We can use num+=1, and also num++ in cpp🤦‍♂️
+  return 0;
+}
diff --git a/Learn-CPP/Day-05/array_intro.cpp b/Learn-CPP/Day-05/array_intro.cpp
new file mode 100644
index 0000000..c7aa37c
--- /dev/null
+++ b/Learn-CPP/Day-05/array_intro.cpp
@@ -0,0 +1,21 @@
+// Arrays are the lists of similar data types
+#include<iostream>
+using namespace std;
+
+int main(void){
+  // <datatype> arrayName [arraySize]
+
+  int arr[] = {1, 2, 3, 4, 5};  // With size as much as the given initialzers
+  int arr1[5] = {1, 2, 3};       // Give the values for 3 places, remaining are 0
+  int arr2[5] = {};              // All five elements are 0
+  // int arr[3] = {1, 2, 3, 4};    // Gives erros, as size of array is 3, but 4 initializers are given
+
+  // print array
+  for(int i=0; i<5; i++) cout<<arr[i]<<" ";
+  cout<<endl;
+
+  // Read array from the user
+  for(int i=0; i<5; i++) cin>>arr2[i];
+
+  return 0;
+}
diff --git a/Learn-CPP/Day-05/array_que.cpp b/Learn-CPP/Day-05/array_que.cpp
new file mode 100644
index 0000000..4632368
--- /dev/null
+++ b/Learn-CPP/Day-05/array_que.cpp
@@ -0,0 +1,29 @@
+// 
+#include<bits/stdc++.h>   // Includes most needed libraries, no other needed
+using namespace std;
+
+int main(void){
+  int n;
+  cout<<"What's the size: ";
+  cin>>n;
+
+  int arr[n] = {};
+  
+  cout<<"Type in all of the elements here separated by space: ";
+  for(int i=0; i<n; i++){
+    cin>>arr[i];
+  }
+
+  // Sort in the increasing order
+  sort(arr, arr + n);
+
+  // Sort in decreasing order
+  sort(arr, arr+n, greater<int>());
+
+  // Print the array
+  for(int i=0; i<n; i++){
+    cout<<arr[i]<<" ";
+  }
+
+  return 0;
+}
diff --git a/Learn-CPP/Day-05/array_uses.cpp b/Learn-CPP/Day-05/array_uses.cpp
new file mode 100644
index 0000000..e84e7e7
--- /dev/null
+++ b/Learn-CPP/Day-05/array_uses.cpp
@@ -0,0 +1,22 @@
+// sum of array elements
+#include<iostream>
+using namespace std;
+
+int main(void){
+  int n;
+  cout<<"What's the size of your array: ";
+  cin>>n;
+
+  int arr[n];
+
+  cout<<"\nDrop in "<<n<<" elements separated by space: ";
+  for(int i=0; i<n; i++){
+    cin>>arr[i];
+  }
+
+  int sum = 0;
+  for(int i=0; i<n; i++) sum+=arr[i];
+
+  cout<<"\nSum of your array elements is: "<<sum;
+  return 0;
+}
diff --git a/Learn-CPP/Day-05/forEach.cpp b/Learn-CPP/Day-05/forEach.cpp
new file mode 100644
index 0000000..aba41b0
--- /dev/null
+++ b/Learn-CPP/Day-05/forEach.cpp
@@ -0,0 +1,23 @@
+// Introduction to for_each loop
+#include<bits/stdc++.h>
+using namespace std;
+
+typedef long int ll;
+
+void utility(ll element){
+  cout<<element<<"*5 = "<<element*5<<endl;
+}
+
+int main(void){
+  ll arr[] = {6, 8, 5, 6, 12};
+  ll n = sizeof(arr)/sizeof(ll);
+
+  ll sum = 0;
+
+  // Have to multiply every element by multiplying by 5
+
+  // Starting address, last address, callback function
+  for_each(arr, arr+n, utility);
+
+  return 0;
+}
diff --git a/Learn-CPP/Day-05/google_que.cpp b/Learn-CPP/Day-05/google_que.cpp
new file mode 100644
index 0000000..34b9838
--- /dev/null
+++ b/Learn-CPP/Day-05/google_que.cpp
@@ -0,0 +1,25 @@
+// https://codingcompetitions.withgoogle.com/kickstart/round/000000000019ffc7/00000000001d3f56#problem
+#include<bits/stdc++.h>
+using namespace std;
+
+int main(void){
+  int n, b, t;
+  cin>>t;
+  
+  for(int _=0; _<t; _++){
+      cin>>n>>b;
+    
+      int arr[n];
+      for(int i=0; i<n; i++) cin>>arr[i];
+    
+      sort(arr, arr+n);
+    
+      int ptr = 0;
+      while(ptr<n && b>=arr[ptr]){
+        b -= arr[ptr++];
+      }
+      cout<<ptr;
+      if(_ != t-1) cout<<endl;
+  }
+  return 0;
+}
diff --git a/Learn-CPP/Day-05/hw/firstInArray.cpp b/Learn-CPP/Day-05/hw/firstInArray.cpp
new file mode 100644
index 0000000..89fd3fa
--- /dev/null
+++ b/Learn-CPP/Day-05/hw/firstInArray.cpp
@@ -0,0 +1,25 @@
+// Write a code, that asks for n and then takes n integers and stores in an array. 
+// Output the first number that is positive and even.
+#include<bits/stdc++.h>
+using namespace std;
+
+int main(void){
+  int n;
+  cout<<"Size of array?: ";
+  cin>>n;
+
+  int arr[n] = {};
+
+  cout<<"Enter the array elements: ";
+  for(int i=0; i<n; i++){
+    cin>>arr[i];
+  }
+  for(auto element:arr){
+    if(element%2==0 && element>0){
+      cout<<element;
+      break;
+    }
+  }
+
+  return 0;
+}
diff --git a/Learn-CPP/Day-05/hw/leapYear.cpp b/Learn-CPP/Day-05/hw/leapYear.cpp
new file mode 100644
index 0000000..a63e535
--- /dev/null
+++ b/Learn-CPP/Day-05/hw/leapYear.cpp
@@ -0,0 +1,20 @@
+/*
+Write a code, that takes an year as in input. and prints it it was a leap year.
+Input-1: 2000 | Ouput-1: Leap Year!
+Input-2: 2004 | Ouput-2: Leap Year!
+Input-3: 1700 | Ouput-3: Not a Leap Year!
+*/
+#include<iostream>
+using namespace std;
+
+int main(void){
+  int year;
+  cout<<"Enter the year to check if it's leap year: ";
+  cin>>year;
+
+  bool isLeap = (year%100==0)?(year%400==0):(year%4==0);
+
+  cout<<year<<" is a "<<(isLeap?"Leap":"Non leap")<<" year";
+
+  return 0;
+}
diff --git a/Learn-CPP/Day-05/hw/reverseNum.cpp b/Learn-CPP/Day-05/hw/reverseNum.cpp
new file mode 100644
index 0000000..7b6a603
--- /dev/null
+++ b/Learn-CPP/Day-05/hw/reverseNum.cpp
@@ -0,0 +1,15 @@
+// Write a code, that a takes an integer as an input, and prints out the number in reversed order.
+#include<bits/stdc++.h>
+using namespace std;
+
+int main(void){
+  int num, front;
+  cout<<"Enter the number to check: ";
+  cin>>num;
+
+  while(num>0){
+    front = num%10;
+  }
+
+  return 0;
+}
diff --git a/Learn-CPP/Day-05/rangeLoop.cpp b/Learn-CPP/Day-05/rangeLoop.cpp
new file mode 100644
index 0000000..e33e3f9
--- /dev/null
+++ b/Learn-CPP/Day-05/rangeLoop.cpp
@@ -0,0 +1,24 @@
+// Range based for loop, we don't need the array size for this
+#include<bits/stdc++.h>
+using namespace std;
+
+typedef long int ll;
+
+int main(void){
+  ll arr[] = {6, 8, 5, 6, 12};
+
+  ll sum = 0;
+
+  // Range based for loop
+  // for(type element variable: iterable)
+  for(int element: arr){    // As the array elements are of int type
+    sum += element;
+  }
+
+  for(auto element: arr){   // To automatically fetch the data type of array elements
+    sum += element;
+  }
+  cout<<sum;
+
+  return 0;
+}
diff --git a/Learn-CPP/Day-06/address.cpp b/Learn-CPP/Day-06/address.cpp
new file mode 100644
index 0000000..75722f0
--- /dev/null
+++ b/Learn-CPP/Day-06/address.cpp
@@ -0,0 +1,10 @@
+// Introduction to address of operator
+#include<iostream>
+using namespace std;
+
+int main(void){
+  int a = 7;
+  cout<<"Value: "<<a;
+  cout<<"\nAddress: "<<(&a);
+  return 0;
+}
diff --git a/Learn-CPP/Day-06/hw/mShape.cpp b/Learn-CPP/Day-06/hw/mShape.cpp
new file mode 100644
index 0000000..652fc05
--- /dev/null
+++ b/Learn-CPP/Day-06/hw/mShape.cpp
@@ -0,0 +1,37 @@
+// Construct the following m-shape
+
+/*
+n = 10    : 2 on 1st row((n-3)/4 +1, 5 on second row(n/2), 3 on third row((n-1)/4+1)
+
+    *       *
+  *   *   *   *   *
+*       *       *
+*/
+#include<iostream>
+using namespace std;
+
+int main(void){
+  // numPoints: Total points, points: points on each line(calculated separately for each line)
+  int numPoints, points;
+  cout<<"Enter the number of points: ";
+  cin>>numPoints;
+
+  // Draw first line
+  // Initial padding is 4 space
+  cout<<"    ";
+  points = (numPoints-3)/4 + 1;
+  for(int i=0; i<points; i++) cout<<"*       ";   // Leave 7 spaces
+  
+  // Second Line
+  // Leave 2 spaces
+  cout<<"\n  ";
+  points = numPoints/2;
+  for(int i=0; i<points; i++) cout<<"*   ";     // 3 spaces
+
+  // Last line
+  cout<<endl;
+  points = (numPoints-1)/4 + 1;
+  for(int i=0; i<points; i++) cout<<"*       ";   // 7 spaces
+
+  return 0;
+}
diff --git a/Learn-CPP/Day-06/hw/printNumbers.cpp b/Learn-CPP/Day-06/hw/printNumbers.cpp
new file mode 100644
index 0000000..e74566b
--- /dev/null
+++ b/Learn-CPP/Day-06/hw/printNumbers.cpp
@@ -0,0 +1,27 @@
+// Print the following pattern
+/*
+n = 5
+        1
+      1   2
+    1   2   3
+  1   2   3   4
+1   2   3   4   5
+
+*/
+#include<iostream>
+using namespace std;
+
+int main(void){
+  int numLines, gaps;
+  cout<<"Enter the number of lines: ";
+  cin>>numLines;
+
+  for(int i=1; i<=numLines; i++){
+    gaps = (numLines - i)*2;
+    for(int j=0; j<gaps; j++) cout<<" ";
+    for(int j=1; j<=i; j++) cout<<j<<"   ";
+    cout<<endl;
+  }
+
+  return 0;
+}
diff --git a/Learn-CPP/Day-06/hw/printRhombus.cpp b/Learn-CPP/Day-06/hw/printRhombus.cpp
new file mode 100644
index 0000000..964353d
--- /dev/null
+++ b/Learn-CPP/Day-06/hw/printRhombus.cpp
@@ -0,0 +1,32 @@
+// Print below rhombus
+/*
+
+n = 4
+      * * * *
+    * * * *
+  * * * *
+* * * *
+
+*/
+
+#include<iostream>
+using namespace std;
+
+int main(void){
+  int numLines, gaps;
+  
+  cout<<"Enter the number of lines: ";
+  cin>>numLines;
+
+  cout<<"Pattern 4 - Rhombus: \n";
+  for(int i=0; i<numLines; i++){
+    gaps = (numLines - i -1)*2;
+    for(int j=0; j<gaps; j++) cout<<" ";
+    for(int j=0; j<numLines; j++){
+      cout<<"* ";
+    }
+    cout<<endl;
+  }
+
+  return 0;
+}
diff --git a/Learn-CPP/Day-06/pattern1.cpp b/Learn-CPP/Day-06/pattern1.cpp
new file mode 100644
index 0000000..75c21c2
--- /dev/null
+++ b/Learn-CPP/Day-06/pattern1.cpp
@@ -0,0 +1,31 @@
+// Print the below array
+/*
+
+for n = 5
+*
+**
+***
+****
+*****
+
+*/
+
+#include<iostream>
+using namespace std;
+
+int main(void){
+
+  // Number of lines
+  int numLines;
+  cout<<"Enter the number of lines: ";
+  cin>>numLines;
+
+  for(int i=0; i<numLines; i++){
+    for(int j=0; j<i+1; j++){
+      cout<<"*";
+    }
+    cout<<endl;
+  }
+
+  return 0;
+}
diff --git a/Learn-CPP/Day-06/pattern2.cpp b/Learn-CPP/Day-06/pattern2.cpp
new file mode 100644
index 0000000..c36780c
--- /dev/null
+++ b/Learn-CPP/Day-06/pattern2.cpp
@@ -0,0 +1,52 @@
+// Print the below pattern
+/*
+
+n = 5
+1
+1 0
+1 0 1
+1 0 1 0
+1 0 1 0 1
+
+*/
+#include<iostream>
+using namespace std;
+
+int main(void){
+  int numLines;
+  bool one;
+
+  cout<<"Enter the number of lines: ";
+  cin>>numLines;
+
+  cout<<"Pattern 2: \n";
+  for(int i=0; i<numLines; i++){
+    one = true;
+    for(int j=0; j<i+1; j++){
+      cout<<(one?1:0)<<" ";
+      one = !one;
+    }
+    cout<<endl;
+  }
+
+  /*
+  Pattern 3
+  1
+  0 1
+  1 0 1
+  0 1 0 1
+  1 0 1 0 1
+  */
+
+ cout<<"\nPattern 3: \n";
+  for(int i=0; i<numLines; i++){
+    one = (i%2 == 0);
+    for(int j=0; j<i+1; j++){
+      cout<<(one?1:0)<<" ";
+      one = !one;
+    }
+    cout<<endl;
+  }
+
+  return 0;
+}
diff --git a/Learn-CPP/Day-06/pointer.cpp b/Learn-CPP/Day-06/pointer.cpp
new file mode 100644
index 0000000..1fabafd
--- /dev/null
+++ b/Learn-CPP/Day-06/pointer.cpp
@@ -0,0 +1,15 @@
+// Pointer saves the address of similar data type variables
+#include<bits/stdc++.h>
+using namespace std;
+
+int main(void){
+  int var = 7;
+  
+  // Create pointer with * before the variable name, and assign the address of a variable to it
+  int *ptr = &var;
+
+  cout<<"Value of var: "<<var;
+  cout<<"\nAddress of var: "<<ptr;
+  cout<<"\nValue of var, from ptr: "<<(*ptr);
+  return 0;
+}
diff --git a/Learn-CPP/Day-06/pointerWithArray.cpp b/Learn-CPP/Day-06/pointerWithArray.cpp
new file mode 100644
index 0000000..501e1af
--- /dev/null
+++ b/Learn-CPP/Day-06/pointerWithArray.cpp
@@ -0,0 +1,16 @@
+// pointer to an array
+#include<iostream>
+using namespace std;
+
+int main(void){
+  int arr[5] = {4, 2, 6, 0, 15};
+  int *arrPtr = arr;
+
+  for(int i=0; i<(sizeof(arr)/sizeof(int)); i++){
+    // Below ptr has changed the value
+    // cout<<"\narr["<<i<<"] = "<<*arrPtr<<" Address: "<<arrPtr++;   // Increase the arrPtr after operation in each loop
+    cout<<"\narr["<<i<<"] = "<<*(arrPtr+i)<<" Address: "<<(arrPtr + i);   // Increase the arrPtr after operation in each loop
+  }
+  free(arrPtr);
+  return 0;
+}
diff --git a/Learn-CPP/Day-06/pointers.md b/Learn-CPP/Day-06/pointers.md
new file mode 100644
index 0000000..8775ffc
--- /dev/null
+++ b/Learn-CPP/Day-06/pointers.md
@@ -0,0 +1,57 @@
+# Pointers
+
+
+|  |
+---
+| Heap memory (Out of scope)   | 
+| Stack Memory (Variables are stored here)  |
+| Code Memory (program scope)  |
+
+
+---
+
+## Heap Memory
+
+RAM outside the scope of the program, `pointers` can be used to point to the heap memory, which is how we can access external files.
+```cpp
+  int *ptr = new int[5]
+  // Points to the array of 5 int elements in heap memory
+```
+
+## Stack Memory
+
+Variables are stored in this memory, which can be pointed by your `ptr`
+```cpp
+  int a = 7;  // a is stored in stack memory
+  int *ptr = &a; // pointers points to a location in stack memory
+```
+
+## Notes
+
+1. Always `free` the memory from the pointer
+```cpp
+  int a = 50;
+  int *ptr = &a;
+  // After the ptr is used, and no more required
+  free(ptr);
+```
+
+2. Never define an uninitialized pointer, they may point to the system file, and may cause the system to crash
+> Always initialize `pointer` with `NULL` or `nullptr`(introduced in **c++11**)
+```cpp
+  int *ptr1 = NULL;
+  int *ptr2 = nullptr;
+```
+
+3. After freeing the memory, pointer is still pointing to some location, which is known as `dangling pointer`(pointing to the empty location)
+```cpp
+  int *m = new int[2];
+  free(m);
+  m = nullptr;
+```
+
+4. You can now `delete` the pointer directly
+```cpp
+int* ptr = new int[2];
+delete(ptr);
+```