编辑代码

#include <stdio.h>

int main() {
    int number;
    int sum,
    n;
    double average;
    n = 0;
    sum = 0;
    scanf("%d", &number);
    while(number != 0) {
        if(number%2 == 0) {
            sum += number;
            n++;
        }
        scanf("%d", &number);
    }
    average = sum*1.0/n;
    printf("%.2lf\n", average);
}