Group18/学籍管理系统 步骤3.c

#include<stdio.h>
#define N 3

struct stu_info
{
	int num;
	float math,physics,english,sum,average;
};

struct stu_info stu[N];

void sort(struct stu_info *stu)
{
	int i,j;
	struct stu_info tmp;
	for(i=0;i<N;i++)
	{
		for(j=0;j<N-i-1;j++)
		{
			if((stu+j)->average>(stu+j+1)->average)
			{
				tmp = *(stu+j);
				*(stu+j) = *(stu+j+1);
				*(stu+j+1) = tmp;
			} 
		}
	}
	return;
}

void input(void)
{
	int i;
	for(i=0;i<N;i++)
	{
		scanf("%d",&stu[i].num);
		scanf("%f",&stu[i].math);
		scanf("%f",&stu[i].physics);
		scanf("%f",&stu[i].english);
		stu[i].sum=stu[i].math+stu[i].physics+stu[i].english;
		stu[i].average=stu[i].sum/3;
	}
	sort(stu);
	for(i=0;i<N;i++)
	{
		printf("%d,%.1f,%.1f\n",stu[i].num,stu[i].sum,stu[i].average);
	}
	return;
} 

int main()
{
	char in;
	printf("                              1.Input\n");
	printf("                              2.Output\n");
	printf("                              3.Order\n");
	printf("                              4.Quit\n");
	scanf("%c",&in);
	switch(in)
	{
		case('i'):
			printf("Please input info of the three students:\n"); 
			input();
			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\n");
	}
	return 0;
}