1 #include <string.h> 2 3 char* strchr(const char * s,int c)4 strchr(const char *s, int c) 5 { 6 char c1; 7 8 if(c == 0) { 9 while(*s++) 10 ; 11 return s-1; 12 } 13 14 while(c1 = *s++) 15 if(c1 == c) 16 return s-1; 17 return 0; 18 } 19