wtf

/*input:
A sequence of numbers (integers), ending with the digit 0
1
2
3
0
output:
The average of the given row of numbers, rounded off to 1 digit after the
        comma:
2.0
test:
Test your developed program on the basis of relevant test scenarios.*/
//----------------------------------------------------------------------------------------------------------------
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>

    double bereken_gemiddelde (int getal)
    {
        static int numberInput = 0;
        static int sum = 0;
        sum = sum + numberInput;
        numberInput++;
        return  sum / numberInput;
        // calculate and return average so far.
    }
    int main(void)
    {
        double gemiddelde = 0;
        while (1)
        {
            int getal;
            scanf("%d", &getal);
            if (getal == 0)
                break; //stops if getal == 0
            else
                gemiddelde = bereken_gemiddelde(0);
        }
        printf("%.1f\n", gemiddelde);
        //system("PAUSE");
        return 1;
    }