# strchr

From cppreference.com
< c‎ | string‎ | byte

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 `str` is of type const T*, the return type is const char*.
  - Otherwise, if `str` is of type T*, the return type is char*.
  - Otherwise, the behavior is undefined.

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

Run this code

    #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

- C23 standard (ISO/IEC 9899:2024):

  - 7.24.5.2 The strchr function (p: TBD)

- C17 standard (ISO/IEC 9899:2018):

  - 7.24.5.2 The strchr function (p: TBD)

- 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

### 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

Retrieved from "https://en.cppreference.com/mwiki/index.php?title=c/string/byte/strchr&oldid=172154"