Add Chapter 3 files and Add Chapter 3 practice set

Author: ExploitEngineer

Chapter 3/07_switch.c

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+#include <stdio.h>
+
+int main()
+{
+    int a = 6;
+    printf("Enter a: ");
+    scanf("%d", &a);
+    switch (a)
+    {
+    case 1:
+        printf("you entered 1\n");
+        break;
+    case 2:
+        printf("you entered 2\n");
+        break;
+    case 3:
+        printf("you entered 3\n");
+        break;
+    case 4:
+        printf("you entered 4\n");
+        break;
+    default:
+        printf("Nothing matched");
+    }
+    return 0;
+}

Chapter 3/08_quiz.c

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+/*
+Quick Quiz: Write a program to find grade of a student given his marks based on below:
+90 - 100 => A
+80 - 90 => B
+70 - 80 => C
+60 - 70 => D
+50 - 60 => E
+<50 => F
+*/
+
+#include <stdio.h>
+
+int main()
+{
+    char grade;
+    int marks = 46;
+    if (marks <= 100 && marks >= 90)
+    {
+        grade = 'A';
+    }
+    else if (marks <= 90 && marks >= 80)
+    {
+        grade = 'B';
+    }
+    else if (marks <= 80 && marks >= 70)
+    {
+        grade = 'C';
+    }
+    else if (marks <= 70 && marks >= 60)
+    {
+        grade = 'D';
+    }
+    else if (marks <= 70 && marks >= 60)
+    {
+        grade = 'E';
+    }
+    else
+    {
+        grade = 'F';
+    }
+    return 0;
+}

Chapter 3/Chapter 3 Practice Set/01_problem.c

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+#include <stdio.h>
+
+int main()
+{
+    int a = 10;
+    if (a = 11)
+    {
+        printf("I am 11");
+    }
+    else
+    {
+        printf("I am not 11");
+    }
+    return 0;
+}

Chapter 3/Chapter 3 Practice Set/02_problem.c

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+#include <stdio.h>
+
+int main()
+{
+    int marks1, marks2, marks3;
+    printf("Enter marks 1: \n");
+    scanf("%d", &marks1);
+    printf("Enter marks 2: \n");
+    scanf("%d", &marks2);
+    printf("Enter marks 3: \n");
+    scanf("%d", &marks3);
+    printf("The marks are %d, %d and %d\n", marks1, marks2, marks3);
+
+    if (marks1 < 33 || marks2 < 33 || marks3 < 33)
+    {
+        printf("You are failed due to less marks in individual subject(s)\n");
+    }
+    else if ((marks1 + marks2 + marks3) / 3)
+    {
+        printf("You are failed due to less percentage\n");
+    }
+    else
+    {
+        printf("You are passed");
+    }
+    return 0;
+}

Chapter 3/Chapter 3 Practice Set/03_problem.c

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+#include <stdio.h>
+
+int main()
+{
+    int income;
+    float tax = 0;
+    printf("Enter income: \n");
+    scanf("%d", &income);
+    if (income <= 250000)
+    {
+        tax = 0;
+    }
+    else if (income > 25000 && income <= 500000)
+    {
+        tax = 0.05 * (income - 250000);
+    }
+    else if (income > 500000 && income <= 1000000)
+    {
+        tax = 0.05 * (500000 - 250000) + 0.2 * (income - 500000);
+    }
+    else
+    {
+        tax = 0.05 * (500000 - 250000) + 0.2 * (1000000 - 500000) + 0.3 * (income - 1000000);
+    }
+    printf("The total tax you need to pay is %.2f", tax);
+    return 0;
+}

Chapter 3/Chapter 3 Practice Set/04_problem.c

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+#include <stdio.h>
+
+int main()
+{
+    int year;
+    printf("Enter year: \n");
+    scanf("%d", &year);
+    if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0)
+    {
+        printf("This is a leap year");
+    }
+    else {
+        printf("This is not a leap year");
+    }
+    return 0;
+}

Chapter 3/Chapter 3 Practice Set/05_problem.c

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+// https://www.cs.cmu.edu/~pattis/15-1XX/common/handouts/ascii.html
+
+#include <stdio.h>
+
+int main()
+{
+    char ch = 'a';
+    printf("The character is %c\n", ch);
+    printf("The value of character is %d\n", ch);
+    // 97, 122
+    if (ch >= 97 && ch <= 122)
+    {
+        printf("This character is lowercase\n");
+    }
+    else
+    {
+        printf("This character is not lowercase");
+    }
+    return 0;
+}

Chapter 3/Chapter 3 Practice Set/06_problem.c

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+#include <stdio.h>
+
+int main()
+{
+    int a = 4, b = 2, c = 6, d = 32;
+    if (a > b && a > c && a > d)
+    {
+        printf("The greatest of all is %d", a);
+    }
+    else if (b > a && b > c && b > d)
+    {
+        printf("The greatest of add is %d", b);
+    }
+    else if (c > a && c > b && c > d)
+    {
+        printf("The greatest of all is %d", c);
+    }
+    else if (d > a && d > c && b > d)
+    {
+        printf("The greatest of all is %d", d);
+    }
+    return 0;
+}

Chapter 3/Chapter 3 Practice Set/practice_set_questions.txt

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+Question no 01). What wil be the output of this program ?
+int a = 10;
+if (a = 11)
+        printf("I am 11");
+else
+    printf("I am not 11");
+
+
+Question no 02). Write a program to determine whether a student has passed or failed. To pass, a student requires a total of 40% and at least 33% in each subject. Assume there are three subjects and take the marks as input from the user.
+
+
+Question no 03). Calculate income tax paid by an employee to the government as per the slabs mentioned below:
+Income Slab         tax
+2.5 - 5.0L          5%
+5.0L - 10.0L        20%
+Above 10.0L         30%
+NOTE: that there is no tax below 2.5L. Take income amount as an input from the user.
+
+
+Question no 04). Write a program to find whether a year entered by the user is a leap year or not. Take year as an input from the user.
+
+
+Question no 05). Write a program to determine whether a character entered by the user is lowercase or not.
+
+
+Question no 06). Write a program to find greatest of four numbers entered by the user.