c语言:找出4数中最大值最小值

n1、n2、n3、n4是一组需要找出最大最小值的整数

#include <>

int main()
{
	int n1, n2, n3, n4, max1, max2, min1, min2, max, min;
	n1 = 38;
	n2 = 43;
	n3 = 10;
	n4 = 90;

	if (n1 >= n2)
	{
		max1 = n1; 
		min1 = n2;
	}
	else
	{
		min1 = n1; 
		max1 = n2;
	}

	if (n3 >= n4)
	{
		max2 = n3;
		min2 = n4;
	}
	else
	{
		max2 = n4; 
		min2 = n3;
	}

	if (max1 >= max2)//大的和大的比较
		max = max1;
	else max = max2;

	if (min1 >= min2)//小的和小的比较
		min = min2;
	else min = min1;

	printf("%d\n", max);
	printf("%d", min);
}