#include <stdio.h>

int main() {
   int a[3] = {0};
   int i = 0;
   int max = 0;
   int min = 1000000;//最大值
   for(i=0;i<3;i++){
   scanf("%d",&a[i]);
   if(a[i]>max){
   max=a[i];
   }
   if(min>a[i])
   {
    min=a[i];
   }
   }
   printf("The maximum number is : %d\n",max);
   printf("The minimum number is : %d\n",min); 
    return 0;
}

利用循环来简化步骤,将要判断的数组成一个数组,便于循环。