关于sizeof（）size（）的有些问题

Posted 2020-08-06 wj0816

#include<iostream>
using namespace std;

int main() {
char a[] = "abcdefg";
string s = a;    
int len = sizeof(a);  //len = 8；

int len_s = sizeof(s);  // len_s = 28；

int lenth = s.size();   //lenth = 7;

int lenth_a = strlen(a);// lenth_a = 7

int lenth_s = strlen(s);  // 错误的

cout << len <<" " <<len_s <<" " << lenth ;
system("pause");
}