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strchr

From cppreference.com
< c‎ | string‎ | byte
Defined in header <string.h>
char *strchr( const char *str, int ch );

Finds the first occurrence of ch (converted to char as if by (char)ch) in the null-terminated byte string pointed to by str (each character interpreted as unsigned char). The terminating null character is considered to be a part of the string and can be found when searching for '\0'.

The behavior is undefined if str is not a pointer to a null-terminated byte string.

Contents

[edit] Parameters

str - pointer to the null-terminated byte string to be analyzed
ch - character to search for

[edit] Return value

Pointer to the found character in str, or null pointer if no such character is found.

[edit] Example

#include <stdio.h>
#include <string.h>
 
int main(void)
{
  const char *str = "Try not. Do, or do not. There is no try.";
  char target = 'T';
  const char *result = str;
 
  while((result = strchr(result, target)) != NULL) {
    printf("Found '%c' starting at '%s'\n", target, result);
    ++result; // Increment result, otherwise we'll find target at the same location
  }
}

Output:

Found 'T' starting at 'Try not. Do, or do not. There is no try.'
Found 'T' starting at 'There is no try.'

[edit] References

  • C11 standard (ISO/IEC 9899:2011):
  • 7.24.5.2 The strchr function (p: 367-368)
  • C99 standard (ISO/IEC 9899:1999):
  • 7.21.5.2 The strchr function (p: 330)
  • C89/C90 standard (ISO/IEC 9899:1990):
  • 4.11.5.2 The strchr function

[edit] See also

finds the last occurrence of a character
(function) [edit]
finds the first location of any character in one string, in another string
(function) [edit]