strchr(): searching for matching character

#include <stdio.h>
#include <string.h>
int main(void){
   char str[100]="Welcome to plus2net";
   char *p; // declaring a pointer variable 
   p = strchr(str,'m');
   printf("value  :%c \n",*p); // output is m  
   printf("Address :%d",p); // output is address of m  
   return 0;
}

#include <stdio.h>
#include <string.h>
int main(void){
   char str[100]="Welcome to plus2net";
   char *p;
   p = strchr(str,'m');
   printf("Position :%d",p-str+1);
   return 0;
}

Position :6

strchr(main_string, search_string);

#include <stdio.h>
#include <string.h>
int main(void){
   char str[100]="Welcome to plus2net";
   char *p;
   p = strchr(str,'m');
   printf("Position :%d , %s",p-str+1,p);
   return 0;
}

Position :6, me to plus2net

Example 1: Finding the First Occurrence of a Character

This example demonstrates how to find the first occurrence of a character in a string using strchr().

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

int main() {
    char str[] = "Welcome to plus2net";
    char *result = strchr(str, 'o');
    
    if (result != NULL) {
        printf("First occurrence of 'o' is at position: %ld\n", result - str);
    } else {
        printf("Character not found.\n");
    }
    
    return 0;
}

First occurrence of 'o' is at position: 4

Example 2: Checking If a Character Exists in a String

Use strchr() to check whether a specific character exists in the string.

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

int main() {
    char str[] = "C programming is fun!";
    char ch = 'p';
    
    if (strchr(str, ch)) {
        printf("The character '%c' exists in the string.\n", ch);
    } else {
        printf("The character '%c' was not found.\n", ch);
    }
    
    return 0;
}

The character 'p' exists in the string.

Example 3: Using strchr() with User Input

This example allows the user to input a string and a character to search for using strchr().

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

int main() {
    char str[100], ch;
    
    printf("Enter a string: ");
    fgets(str, sizeof(str), stdin);
    str[strcspn(str, "\n")] = '\0';  // Remove newline character
    
    printf("Enter a character to search for: ");
    scanf("%c", &ch);
    
    if (strchr(str, ch)) {
        printf("The character '%c' was found in the string.\n", ch);
    } else {
        printf("The character '%c' was not found in the string.\n", ch);
    }
    
    return 0;
}

Enter a string: Welcome to C programming
Enter a character to search for: g
The character 'g' was found in the string.