出现output limit exceeded，应该怎么改？

Question

#include
using namespace std;
int main()
{
int num;
cin>>num;
while(num!=1)
{
if(num%2==0)
{
cout<<num<<"/2="<<num/2<<endl;
num=num/2;
}
else
{
cout<<num<<"*3+1="<<num*3+1<<endl;
num=num*3+1;
}
}
cout<<"End";
return 0;
}

Answer 1

while(num != 1)
{
    if(num%2==0)
    {
        cout<<num<<"/2="<<num/2<<endl;
        num=num/2;
    }
    else
    {
        cout<<num<<"*3+1="<<num*3+1<<endl;
        num=num*3+1;
    }
    cin>>num;   //不添加这个，这个While就死循环了。。。
}