编辑代码

#include <stdio.h>
int main () {
   int number;
   int sum = 0;
   int count = 0;

   scanf("%d",&number);
   while ( number != -1){
       sum += number;
       count ++;
       scanf("%d",&number);
   }

   printf("%f\n",1.0*sum/count);
    return 0;
}