为啥单个可以，管道就不行了

Question

#include<stdio.h>int main(){   int s,count;   scanf("%d %d",&s,&count);   float avg;   avg = s / count;   printf("The average value is %.3f\n",avg);   return 0;}#include<stdio.h>int main(){    printf("Input some int value (end by 0):\n");    int i,s=0,count=0;    int flag=1;    while(flag){        scanf("%d",&i);        if(i == 0) break;        s+=i;        count++;    }    printf("%d %d\n",s,count);    return 0;}

Answer 1

什么管道？