C - strchr() function

C strchr() function - string scanning operation

The strchr() function is used to find the first occurrence of a character in a given string or it returns NULL if the character is not found. The null terminating character is included in the search.

Syntax:

char *strchr(const char *str, int c)

Parameters:

Return value from strchr()

Upon completion, strchr() shall return a pointer to the byte, or a null pointer if the byte was not found.

Example: strchr() function

This example finds the first occurrence of the character "C", "g", "a" and "." in "C Programming.".

#include <stdio.h>
#include <string.h>
 
#define SIZE 40
 
int main(void)
{
  char str1[SIZE] = "C Programming.";
  int ch = 'C';
  char* ptr = strchr(str1, ch);  
  printf( "The first occurrence of %c in '%s' is '%d'\n",
            ch, str1, ptr - str1 + 1 );
  ch = 'a';
  ptr = strchr(str1, ch);  
  printf( "The first occurrence of %c in '%s' is '%d'\n",
            ch, str1, ptr - str1 + 1 );
  ch = 'g';
  ptr = strchr(str1, ch);  
  printf( "The first occurrence of %c in '%s' is '%d'\n",
            ch, str1, ptr - str1 + 1 );
  ch = '.';
  ptr = strchr(str1, ch);  
  printf( "The first occurrence of %c in '%s' is '%d'\n",
            ch, str1, ptr - str1 + 1 );
}

Output:

The first occurrence of C in 'C Programming.' is '1'
The first occurrence of a in 'C Programming.' is '8'
The first occurrence of g in 'C Programming.' is '6'
The first occurrence of . in 'C Programming.' is '14'

C Programming Code Editor:

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