#include<iostream>
#include<stdexcept>
using namespace std;
int main()
{
int a,b;
label: cin>>a>>b;
try
{
if(b==0)throw runtime_error("重输");
cout<<a/b<<endl;
}
catch(runtime_error err)
{
cout<<err.what()
<<"重输"<<endl;
goto label;
}
return 0;
}
原文：http://www.cnblogs.com/KennyRom/p/5855040.html