```cpp
#include <iostream>
using namespace std;
double calcPerim(double length, double width);
int main() {
double roomLen = 8;
double roomWid = 6;
double roomPerim;
roomPerim = calcPerim(roomLen, roomWid);
cout << "Room perimeter is: " << roomPerim;
return 0;
}
double calcPerim(double length, double width) {
return 2 * (length + width);
}
```