自考新教材--p52

源程序：

#include <iostream>

#include <string>

using namespace std;

int main()

{

string s1, s2;

s1 = "c++程序";

s2 = s1;

string s3;

cout << "s3=" << s3 << endl;

s3 = s1 + s2;

cout << s1 + s2 << endl;

cout << "s3=" << s3 << endl;

bool b = s1 < s3;

cout << "bool=" << b << endl;

char c = s1[2];

cout << "c=" << c << endl;

cout << s1[2] << endl;

char arrstr[] = "Hello";

s3 = s1 + arrstr;

cout << s3 << endl;

system("pause");

}

运行结果：