C PRIMER PLUS（第六版编程练习）9.11编程练习_6题

/*编写并测试一个函数，该函数以3个double变量的地址作为参数，
把最小值放入第1个变量，中间值放入第2个变量，最大值放入第3个变量。
*/
#include<stdio.h>
void test(double *pa, double *pb, double *pc);
int main(void)
{
	double a, b, c;
	printf("请输入3个数字：");
	scanf("%lf %lf %lf", &a, &b, &c);
	test(&a, &b, &c);
	printf("a=%lf b=%lf c=%lf", a, b, c);
	return 0;

}
void test(double* pa, double* pb, double* pc)
{
	double min = *pa;
	double max = *pc;
	double mid;
	if (min > *pb)
	{
		min = *pb;
	}
	if (min > * pc)
	{
		min = *pc;
	}
	if (max < *pa)
	{
		max = *pa;
	}
	if (max < *pb)
	{
		max = *pb;
	}
	mid = *pa + *pb + *pc - max - min;
	*pa = min;
	*pb = mid;
	*pc = max;
}