C Program to Find the First Occurrence of any Character of String2 in String1

This is a C Program to find the first occurence of the any character of String2 in string1 & also its position.

Problem Description

This program takes two strings as input and finds the first occurence of the any character of String2 in string1 & also its position.

Problem Solution

1. Take two strings as input.
2. Compare both the strings using two pointers.
3. Print the character which matches first and its position.

Program/Source Code

Here is source code of the C Program to find the first occurence of the any character of String2 in string1 & also its position. The C program is successfully compiled and run on a Linux system. The program output is also shown below.

```
/*
```
```
/*
```

 * C Program to Find the First Occurence of the any Character of

 * String2 in string1 & also its Position

```
 */
```
```
#include <stdio.h>
```
```
 
```
```
void main()
```
```
{
```
```
    char s1[50], s2[10];
```
```
    int i, flag = 0;
```
```
    char *ptr1, *ptr2;
```
```
 
```
```
    printf("\nenter the string1:");
```
```
    scanf(" %[^\n]s", s1);    
```
```
    printf("\nenter the string2:");
```
```
    scanf(" %[^\n]s", s2);
```
```
 
```

    /*COMPARING THE STRING1 CHARACTER BY CHARACTER WITH ALL CHARACTERS OF STRING1*/

    for (i = 0, ptr1 = s1;*ptr1 !=  '\0';ptr1++)

```
    {
```
```
        i++;
```

        for (ptr2 = s2; *ptr2 != '\0';ptr2++)

```
        {
```
```
            if (*ptr1  ==  *ptr2)
```
```
            {
```
```
                flag = 1;
```
```
                break;
```
```
            }
```
```
        }
```
```
        if (flag  ==  1)
```
```
            break;
```
```
    }
```
```
 
```
```
    if (flag  ==  1)
```

        printf("\nfirst occurance of character of string2 in string1 is at position:%d and character is %c", i, *ptr2);

```
    else
```

        printf("\nnone of the characters of string1 match with mone of characters of string2");

```
}
```

Program Explanation

1. Take two strings as input and store it in the array’s s1[] and s2[].
2. Use pointers ptr1 and ptr2 to point the array’s s1[] and s2[] respectively.
3. Compare each character of the array s2[] with the array s1. Use the variable i to find the position.
4. Print the character which matches first and the variable i for the position.

Runtime Test Cases

 
enter the string1:C Programming Class
 
enter the string2:rnp
 
first occurance of character of string2 in string1 is at position:3 and character is p

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