# include<cstdio>
# include<iostream>
# include<string>
using namespace std;
int main(void)
{
string s1("Hello");
string s2(8,'x');
string month = "March";
string ob;
cin>>ob;//string 支持流读取运算符
string s;//string 支持getline函数
getline(cin,s);
string s1("cat"),s2;
s2 = s1;//用等号赋值
string s1("cat"),s3;
s3.assign(s1);//用assign()成员函数进行赋值
string s1("cartsfasf"),s3;
s3.assign(s1,1,3);//把s1......
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