要for迴圈嗎?

#include<stdio.h>
void main()
{
for(y=1; y<10; y++)
{}
cout<<"*"<<endl;
cout<<"**"<<endl;
cout<<"***"<<endl;
cout<<"****"<<endl;
cout<<"*****"<<endl;
cout<<"****"<<endl;
cout<<"***"<<endl;
cout<<"**"<<endl;
cout<<"*"<<endl;
}