warning c4700

learning functions and I am having trouble with some local variables. I keep getting "warning C4700: uninitialized local variable 'y' used", same for the variable x. Are my loops in combinations with cin >> messing up the code? I am pretty new to programming, any help would be greatly appreciated. Heres the code:

Code:

#include <iostream>
using namespace std;

//function prototype
double calculateRetail(double, double);

int main()
{
	double x, y, z;
	
	while(x < 0)
	{
		cout << "This progam calculates and displays an items retail price. Enter the whole sale price...\n";
		cin >> x;
	}

	while(y < 0)
	{
		cout << "Enter the markup percentage...\n";
		cin >> y;
	}


	z = calculateRetail(x, y);
	cout << z << " is the retail price.\n";
	return 0;
}
	
double calculateRetail(double x, double y)
{
	return x * y * .01;
}

As the message says, you compare x < 0 and y < 0 before initialising x and y with some value. Perhaps a do while loop is what you want, but note that you are assuming that the user enters integral input.

Thank you. The Do-while loop worked perfectly, I also had my math wrong lol =).

Anyways, heres what the code is now.

Code:

#include <iostream>
using namespace std;

//function prototype
double calculateRetail(double, double);

int main()
{
	double x, y, z;
	
	do
	{
		cout << "This progam calculates and displays an items retail price. Enter the whole sale price...\n";
		cin >> x;
	}while(x < 0);

	do
	{
		cout << "Enter the markup percentage...\n";
		cin >> y;
	}while(y < 0);


	z = calculateRetail(x, y);
	cout << z << " is the retail price.\n";
	return 0;
}
	
double calculateRetail(double x, double y)
{
	return x * (y + 100) * .01;
}

Incidentally, instead of naming your variables x, y and z, use descriptive names like whole_sale_price, markup_percentage, and retail_price.

Thank you for the tip, I will make sure to do that in the future =)