lab2/program 3.c

#include<stdio.h>
struct stu
{
	int num;
	float m,p,e,s,a;
};

struct stu stu[3];

void min(struct stu *stu)
{
	int i,j;
	struct stu t;
	for(i=0;i<3;i++)
	{
		for(j=0;j<2-i;j++)
		{
			if((stu+j)->a>(stu+j+1)->a)
			{
				t= *(stu+j);
				*(stu+j) = *(stu+j+1);
				*(stu+j+1) = t;
			} 
		}
	}
	return;
}

void dd(void)
{
	int i;
	for(i=0;i<3;i++)
	{
		scanf("%d",&stu[i].num);
		scanf("%f",&stu[i].m);
		scanf("%f",&stu[i].p);
		scanf("%f",&stu[i].e);
		stu[i].s=stu[i].m+stu[i].p+stu[i].e;
		stu[i].a=stu[i].s/3;
	}
	min(stu);
	for(i=0;i<3;i++)
	{
		printf("%d,%.1f,%.1f\n",stu[i].num,stu[i].s,stu[i].a);
	}
	return;
} 

int main()
{
	char input;
	printf("                              1.Input\n");
	printf("                              2.Output\n");
	printf("                              3.Order\n");
	printf("                              4.Quit\n");
	scanf("%c",&input);
	switch(input)
	{
		case('i'):
			dd();
			break;
		case('o'):
			printf("You are trying to Output info\n");
			break;
		case('m'):
			printf("You are trying to Make things ordered\n");
			break;
		case('q'):
			printf("You are about to Quit\n");
			break;
		default:
			printf("Wrong input");
	}
	return 0;
}