int main()
{
double n, count=0, sum=0;
for (;;)
{
	cin >> n;
	if (n <0 || n >100) cout << "out of range; ignored." << endl;
	if (n <0 || n >100) cin >> n;
	if (n <= 0) break;
	++count;
	sum += n;
}
cout << "The average is " << float (sum)/count << endl;
}

    double x;


    while (cin >> x) { // the condition is false if eof or anything non-numeric is entered

        //
        // Do whatever you need to do inside the loop
        //

    }

    int num;
    double x;


    num = 0;
    while (cin >> x) {
        if ((x < 0) || (x > 100)) {
            cout << "Value " << x 
                 << " is out of range, and is ignored." << endl;
        }
        else {
            ++num;
            // do whatever you need to do with valid values
        }
    }
    cout << "The number of valid values is " << num << endl;
    //
    // Do whatever you need to do after the loop.
    //

#include <iostream>

using namespace std;
//Write a program that reads a series of numbers (doubles) from the user, then prints the mean and the
//range.
//Notes:
//• You do not know ahead of time how many numbers will be in the list.
//• When you want to stop entering numbers, enter control-z.
//• The range is the difference between the lowest and the highest number.
//• The numbers will be in the range of 0.0 to 100.0. Ignore any numbers outside of this range.
int main()
{
double n, count=0, sum=0;
for (;;)
{
	if( cin.eof( ) ) break;
	while (cin >> n)
		if (n <0 || n >100){
			cout << "out of range; ignored." << endl;
		}
		else {
			++count;
			sum += n;
		}
}
cout << "The average is " << float (sum)/count << endl;

}

#include <iostream>

using namespace std;

int main()
{
    double n, count = 0, sum = 0;
    while (cin >> n) {
        if (n < 0 || n > 100) {
            cout << "out of range; ignored." << endl;
        }
        else {
            ++count;
            sum += n;
        }
    }
    cout << "The average is " << float (sum) / count << endl;

    return 0;
}