Microsoft Visual C++ 2008 Express Edition

This is suppose to be a program to prompt someone to calculate their commission. This is what I have:

#include <iostream>
using namespace std;
int main(){
double commission, rate, week1, week2, returns;

cout << "enter commission rate";
cin >> rate;
cout << "enter week 1 earnings";
cin >> week1;
cout << "enter week 2 earnings";
cin >> week2;

commission = rate * (week1 + week2 - returns);

system "pause";
return 0;

}

The errors that I have are:

error C2143: syntax error : missing ';' before 'string'

and

warning C4551: function call missing argument list