用string方法定义字符串变量

实现代码：

复制代码 代码如下:

#include<iostream>

#include<string>

using namespace std;

int main(){

string a,b,c,t;

cout<<"please input first string:"<<endl;

cin>>a;

cout<<"please input second string:"<<endl;

cin>>b;

cout<<"please input third string:"<<endl;

cin>>c;

if(a>b){

t=a;

a=b;

b=t;

}

if(a>c){

t=a;

a=c;

c=t;

}

if(b>c){

t=b;

b=c;

c=t;

}

cout<<a<<"<<"<<b<<"<<"<<c<<endl;

return 0;

}