strchr

Defined in header <string.h> 
char *strchr( const char *str, int ch );
 (1) 
/*QChar*/ *strchr( /*QChar*/ *str, int ch );
 (2) (since C23)
1) Finds the first occurrence of ch (after conversion 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'.
2) Type-generic function equivalent to (1). Let T be an unqualified character object type. If a macro definition of each of these generic functions is suppressed to access an actual function (e.g. if (strchr) or a function pointer is used), the actual function declaration (1) becomes visible.

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

Parameters

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

Return value

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

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.'

References

See also

memchr
 searches an array for the first occurrence of a character
(function)
strrchr
 finds the last occurrence of a character
(function)
strpbrk
 finds the first location of any character in one string, in another string
(function)
C++ documentation for strchr

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