Possible combination of Integers

#include<iostream>
using namespace std;
int main()
{
int i,j,k;
int num;
cout<<"Please enter an integer: "<<endl;
cin>>num;
for(i=1;i<=num;i++)

for(j=1;j<=num;j++)


for(k=1;k<=num;k++)

cout<<i<<j<<k<<"\t";
cout<<endl;
return 0;
}