Help please for giving me any tips .....

My problem is I dont know here what to return in the function defination.????
This is the question.
Write a funcn that displays a solid square of asterisks whose side is specified in integer parameter side.For eg.
if side is 4 the funcn displays
****
****
****
****

My code till now:

int solid sq(int)
int main()
{
int num;
cout<<"enter how many sides"<<endl;
cin>>num;
cout<<solidsq(num)------------ ???//NOT SURE//
return 0;
}
int soildsq(int x)
{
int counter=0;
int count =0;
for(counter=0;counter<=x;counter++)
{
for(count=0;count<=x;count++)
{
cout<<"*";
}
cout<<endl;
}
return ???????---------NOT AT ALL SURE???
}