原型:char *strstr(const char *str1, const char *str2);#include找出str2字符串在str1字符串中第一次出现的位置(不包括str2的串结束符)。返回该位置的指针,如找不到,返回空指针。Returns a pointer to the first occurrence of strSearch in str, or NULL if strSearch does not appear in str. IfstrSearch points to