13_goto.c

// Program to calculate the sum and average of positive numbers
// If the user enters a negative number, the sum and average are displayed.

#include <stdio.h>

int main()
{

    const int maxInput = 100;
    int i;
    double number, average, sum = 0.0;

    for (i = 1; i <= maxInput; ++i)
    {
        printf("%d. Enter a number: ", i);
        scanf("%lf", &number);

        // go to jump if the user enters a negative number
        if (number < 0.0)
        {
            goto jump;
        }
        sum += number;
    }

jump:
    average = sum / (i - 1);
    printf("Sum = %.2f\n", sum);
    printf("Average = %.2f", average);

    return 0;
}