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;
}