How do i change the input?

[iluvanimestyle]

#include <iostream.h>
#include <conio.h>

int main()
{

	double meannumbers;
	double totalmeannumbers = 0;
	double totalamountofnumbers = 0;
	double holder=100;
	double lowest;

	clrscr();
	cout << "Enter your first test score\n" <<endl;
	cin>>meannumbers;
	holder = meannumbers;

	while (meannumbers !=-1)
	{
		totalmeannumbers = totalmeannumbers + meannumbers;
		totalamountofnumbers ++;

		cout << "Enter your next test score or enter -1 to quit."<<endl;
		cin >> meannumbers;
		if (meannumbers <= holder && meannumbers >=0)
		{
			holder = meannumbers;

		}

	}

	cout<< "The average of the numbers is " << (totalmeannumbers-holder)/(totalamountofnumbers-1);
	getch();
	return 0;
}

i wanna make the input as "q" instead of "-1". When i do while (meannumbers !='q'), it just leads me to an infinite loop? BTW this code works perfectly i just wanna change the terminating input to q instead of -1

[laserlight]

Read into a string instead, then parse the string into a double if it is not equal to "q". You may need to rework your current loop logic a little too.