求3个数中最大的数

#include<stdio.h>
#define MAX(a,b,c) (a)>(b)?((a)>(c)?(a):(c)):((b)>(c)?(b):(c))
int test1(int a, int b,int c)
{
	int max = a;
	if (max < b)
		max = b;
	if (max < c)
		max = c;
	return max;
}
int main()
{
	int a = 10;
	int b = 20;
	int c = 30;
	int Max = test1(a,b,c);
	printf("Max = %d\n", Max);//借助第四个变量比较
	printf("Max = %d\n", MAX(a,b,c));//借助宏
	system("pause");
	return 0;
}