#include<stdio.h> #define max(a,b) ((a>b) ? a:b) #define min(a,b) ((a<b) ? a:b) void main() { int a,b,c,d; printf("input four numbers :\n"); scanf("%d,%d,%d,%d",&a,&b,&c,&d); printf("The max number is : %",max(a,max(b,max(c,d)))); printf("The min number is : %",min(a,min(b,min(c,d)))); } 测试结果: