C Programming/C Reference/string.h/strchr
Function name strchr() for C and C++
char *strchr(const char *s, int c);
The strchr() function locates the first occurrence of c, cast to char, in the string pointed to by s. The terminating null character is considered a part of the string.
s Points to the string to be searched.
c Is the character to search for in string s.
The strchr() function returns a pointer to the first occurrence of character c located within s. If character c does not occur in the string, strchr() returns a null pointer.