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#include <iostream>
#include <string>
using namespace std;
void main()
{
string s1="abc",s2="def";
cout<<s1.size()<<endl; //输出s1的字符串长度 3
cout<<s2.size()<<endl; //输出s2的字符串长度 3
s1=s1+s2; //输出s1的字符串长度 6
cout<<s1.size()<<endl;
cout < <s1 < <endl;
}