C 中如何求子字符串函数?
//以下代码含char[]数组和base_string两种实现方式#include #include //base_string库#include //C语言的string。h库using namespace std;char * substr(char *dest, char *src, long head, size_t n){ strncpy(dest,&src[head],n); dest[n] = ' '; return dest;}int main(){ char cstr_org[32]={"ABCDEFGHIJGKLMNOPQRSTUVWXYZ"}; char cstr...全部
//以下代码含char[]数组和base_string两种实现方式#include #include //base_string库#include //C语言的string。h库using namespace std;char * substr(char *dest, char *src, long head, size_t n){ strncpy(dest,&src[head],n); dest[n] = ' '; return dest;}int main(){ char cstr_org[32]={"ABCDEFGHIJGKLMNOPQRSTUVWXYZ"}; char cstr_new[32]; string str_org=cstr_org; string str_new; //字符数组char[]实现 substr(cstr_new,cstr_org,0,4);//前四个字符 cout substr(cstr_new,cstr_org,7,4);//中间四个字符(从[7]开始) cout substr(cstr_new,cstr_org,strlen(cstr_org)-4,4);//后四个字符 cout //base_string字符串实现 str_new=str_org。
substr(0,4);//前四个字符 cout str_new=str_org。substr(8,4);//中间四个字符(从[7]开始) cout str_new=str_org。substr(str_org。
length()-4,4);//后四个字符 cout return 0;}。收起