第二题呀，我不知道我错在哪里了
#include <stdio.h>
int even(int n);

int main() {
int n;
int sum = 0;
printf("输入一批正整数:\n");

while (n >= 0) {
scanf("%d", &n);
if (n <= 0)
break;

if (even(n) == 0) {
sum += n;
}
}
printf("奇数和为%d\n", sum);
return 0;

}

int even(int n) {
int number;
if (n % 2)
number = 0;
else
number = 1;
return number;
}