关于 string
请教各位大虾

#include <iostream>
#include <string>
using namespace std;
int main()
{
string s1,s2;
cout < < "Enter two strings: " < <endl;
cin> > s1> > s2;
string::size_type len1,len2;
len1=s1.size();
len2=s2.size();
if (len1=len2)
cout < < "They have some length. " < <endl;
else if(len1> len2)
cout < < "\ " " < <s1 < < "\ "is longer than "
< < "\ " " < <s2 < < "\ " " < <endl;
else
cout < < "\ " " < <s2 < < "\ "is longer than "
< < "\ " " < <s1 < < "\ " " < <endl;
getchar ();
return 0;

}

运行输入俩个string对象后没出现结果？
这是C++primer 书上例题！


[解决办法]
这样应该编译时都通不过吧.
getchar ();这是哪里的啊,没有包含头文件#include <stdio.h>



[解决办法]
==号让你打成了=
这样只会有一个结果They have some length.
[解决办法]
请添加#include <stdio.h>
请修改=为==
问题解决.

以后写代码,仔细点