#include<stdio.h>
int main(void)
{ int a,b,c,d,max1,min1,max2,min2;
printf("请输入四位整数:");
scanf("%d %d %d %d",&a,&b,&c,&d);
if(a>b)
{max1=a;min1=b;}
else
{max1=b;min1=a;}
if(c>d)
{max2=c;min2=d;}
else
{max2=d;min2=c;}
if(max1<max2)
max1=max2;
if(min1>min2)
min1=min2;
printf("最大值是%d\n",max1);
printf("最小值是%d\n",min1);
return 0;
}