vc6.0新人求解

#include<iostream>
#include<ionanip>
using namespace std;
void main()
{
    int a;
    int b;
    cout<<"Hello word!\n";
    cin>>a>>b;
    cout<<"a="<<a+1<<"    b="<<b-1<<endl;
    cout<<3.1415926<<endl;
    cout<<setprecision(8)<<3.1415926<<endl;
    return;
}
运行的时候报需要组建呐