//C++ Primer Plus -- Chapter 3--5

#include <iostream>
int main ()
{
	using namespace std;
	long double world;
	cout<<"Enter the world's population:";
	cin>>world;
	cout<<"Enter the population of the USA:";
	long double usa;
	cin>>usa;
	cout<<"The population of the US is "<<usa/world*100<<"% of the world population."<<endl;
	return 0;

}