solve_problem.c

// /  // 👉👉  🔹🔹  Question 1️⃣    create a string firstName & lastName
// to sore details of user  & print all characters using  a loop

#include <stdio.h>
void string(char arr[]);
int main()
{
    char firstName[] = "coder";
    char lastName[] = "Boy";
    string(firstName); // function call
    string(lastName);  // last name
    return 0;
}
// function Definition
void string(char arr[])
{
    for (int i = 0; arr[i] != '\0'; i++) // spacial  in  loop => arr[i]   | for string
    {
        printf("%c", arr[i]);
    }
    printf("\n");
}

//   👉👉  🔹🔹  Question  2️⃣  Ask the user to enter  their firstName & print in back  to them
//                🌟also try this with their fullName

#include <stdio.h>
int main()
{
    char name[20];
    printf("Enter Your Firstname : ");
    scanf("%s", name);
    printf("Your name is %s ", name);
    char str[100];
    fgets(str, 100, stdin);
    puts(str);
    return 0;
}

//   👉👉  🔹🔹  Question  3️⃣  make a  program thats input s user's name & print its length;

#include <stdio.h>
int lengthStr(char arr[]);

int main()
{
    char name[100];
    fgets(name, 100, stdin);
    printf("Length is %d", lengthStr(name));
    printf("\n");
    return 0;
}

// Fucntion Definition
int lengthStr(char arr[])
{
    int count = 0;
    for (int i = 0; arr[i] != '\0'; i++)
    {
        count++;
    }
    return count - 1;
}

// 👉👉  🔹🔹    add 2.0 version of  3️⃣rd problem

#include <stdio.h>
#include <string.h>
int main()
{
    char name[] = " Code-Lover";
    int length = strlen(name);
    printf("length is %d\n", length);
    return 0;
}
// 👉👉  🔹🔹  question 4️⃣  take a string  input from the user using %c

#include <stdio.h>
int main()
{
    char srt[15];
    char ch;
    int i = 0;
    while (ch != '\n')
    {
        scanf("%c", &ch);
        srt[i] = ch;
        i++;
    }
    srt[i] = '\0';
    puts(srt);

    return 0;
}

#include <stdio.h>
int main()
{
    char str[120];
    char ch;
    int i = 0;
    while (ch != '\n')
    {
        scanf("%c", &ch);
        str[i] = ch;
        i++;
    }
    str[i] = '\0';
    puts(str);

    return 0;
}

//  |🌟 ✨|  salting
// // 👉👉  🔹🔹  question  5️⃣  find the salted from a password  entered by the user
//  if the salt "123"  & added that the end

#include <stdio.h>
#include <string.h>
void salting(char password[]);
int main()
{
    char password[100];
    scanf("%s", password);
    salting(password);

    return 0;
}
void salting(char password[])
{
    char salt[] = "123 ";
    char newPass[200];
    strcpy(newPass, password); //  newPass =  something
    strcat(newPass, salt);     // new pass = something   + 123  || strcat =   +
    puts(newPass);
}

// //  👉👉  🔹🔹  question 6️⃣  write a fuction named slice , which takes
//  a string & returns sclice from string  from index n to m

#include <stdio.h>
void sclice(char str[], int n, int m);
int main()
{
    char str[] = "Coder Boy";
    sclice(str, 3, 6); // Function call
    return 0;
}

//  Function Definition
void sclice(char str[], int n, int m)
{
    char newStr[45];
    int j = 0;
    for (int i = n; i <= m; i++, j++)
    {
        newStr[j] = str[i];
    }
    newStr[j] = '\0';

    puts(newStr);
}

// //  👉👉  🔹🔹  question  7️⃣  write a function  to count occurrence of vowels in a  string

#include <stdio.h>
int countVowels(char str[]);
int main()
{
    char str[] = "Education";
    printf("Vowel are : %d\n", countVowels(str)); // Function call ;
    return 0;
}
//  Function Definition
int countVowels(char str[])
{
    int count = 0;
    for (int i = 0; str[i] != '\0'; i++)
    {
        if (str[i] == 'a' || str[i] == 'e' || str[i] == 'i' || str[i] == 'o' || str[i] == 'u')
        {
            count++;
        }
    }
    return count;
}

// //  👉👉  🔹🔹question 8️⃣ check a given Character  is present  in a string  or not
#include <stdio.h>
void checkStr(char str[], char ch);
int main()
{
    char str[] = "Coder Boy ";
    char ch = 'B';
    checkStr(str, ch);
    return 0;
}
void checkStr(char str[], char ch)
{
    for (int i = 0; str[i] != '\0'; i++)
    {
        if (str[i] == ch)
        {
            printf("Character is present \n");
            return;
        }
    }
    printf("Character is Not  present \n");
}

// 1️⃣ 2️⃣ 3️⃣ 4️⃣ 5️⃣ 6️⃣ 7️⃣ 8️⃣ 9️⃣ 🔟