#include<stdio.h>#include<stdlib.h>#include<string.h>char *mystrchr(char *str, char c){ int i; for (i = 0; i<strlen(str); i++) { if (*(str + i) == c) { return str + i; } } return NULL;}int main(){ char *str = "abcdef"; char c = 's'; char *fin = mystrchr(str, c); printf("%s", fin); system("pause"); return 0;}