/**原型:char *strrchr(const char *s,int ch);*用法:#include <string.h>*功能:查找字符串s中第一次出现字符c的位置*说明:返回最后一次出现c的位置的指针,如果s中不存在c则返回NULL。*编程实现strrchr*/#include <cstdio>#include <cassert>char * _strrchr(const char * str, int ch){ assert(str != NULL); for( ; *str != (char)ch; str++) if(*str == '\0') return NULL; return (char *)str;}int main(){ char str[] = "This is a sample string"; char *pch = _strrchr(str,'s'); printf("The last occurence of 's' found at : %d",pch - str + 1); getchar(); return 0;}
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