C strchr() method

This function searches for the first occurrence of a character in a string.

Syntax:


strchr(str, c)

Parameters:

str: A pointer to the string to search.
c: The character to search for (it’s treated as an int but represents a character).

Return Value:

A pointer to the first occurrence of the character c in str.
if the character c is not found in the string then value NULL will be return.

Example:


#include <stdio.h>
#include <string.h>

int main() {
    char str[] = "My World";
    
    char *ptr = strchr(str, 'W');
    if (ptr != NULL) {
        printf("First occurrence of 'W': %s\n", ptr);  // Output:  World
    } else {
        printf("'W' not found.\n");
    }
    
    return 0;
}

Output:

First occurrence of ‘W’: World

C strchr() method – Interview Questions

Q 1: What does strchr() do?

Ans: It finds the first occurrence of a character in a string.

Q 2: What is the return type of strchr()?

Ans: Pointer to the character found or NULL.

Q 3: Which header file contains strchr()?

Ans: <string.h>.

Q 4: Is strchr() case-sensitive?

Ans: Yes, it is case-sensitive.

Q 5: What happens if the character is not found?

Ans: It returns NULL.