Group18/学籍管理系统步骤8.c

#include<stdio.h>
#include<string.h> 
#include<stdlib.h> 
int N=0;
void menu();
struct stu_info
{
	int cls,flag;
	char name[10],num[10];
	float maths,physics,english;
}
stu[20];
void output()
{
	int i;
	for(i=0;i<N;i++)
	printf("%s %d %s %.1f %.1f %.1f\n",stu[i].num,stu[i].cls,stu[i].name,stu[i].maths,stu[i].physics,stu[i].english);
}
void sort(struct stu_info *stu,int n)
{
	int i,j;
	struct stu_info tmp;
	for(i=0;i<n;i++)
	{
		for(j=0;j<n-i-1;j++)
		{
			if(((stu+j)->cls>(stu+j+1)->cls)||((stu+j)->cls==(stu+j+1)->cls)&&((stu+j)->num>(stu+j+1)->num))
			{
				tmp = *(stu+j);
				*(stu+j) = *(stu+j+1);
				*(stu+j+1) = tmp;
			} 
		}
	}
	return;
}
void input()
{
	int i;
	char y[5];
	for(i=0;;i++)
	{
		printf("Id ");scanf("%s",stu[i].num);
		printf("class ");scanf("%d",&stu[i].cls);
		printf("name ");scanf("%s",stu[i].name);
		printf("score1 ");scanf("%f",&stu[i].maths);
		printf("score2 ");scanf("%f",&stu[i].physics);
		printf("score3 ");scanf("%f",&stu[i].english);
		printf("Continue?\n");
		again1:
		scanf("%s",y);
		if(strcmp(y,"yes")==0) continue;
		else if(strcmp(y,"no")==0)
		{
			N=i+1;
			menu();
			break;
		}
		else
		{
			printf("wrong input\n");
			goto again1;
		}
	}
}
void del(struct stu_info* stu)
{
	char key[10];char y[5];
	scanf("%s",key);
	int i;
	for (i=0;i<N;i++)
	{
		if(strcmp((stu+i)->num,key)==0||strcmp((stu+i)->name,key)==0)
		{
			N--;
			for(int j=i;j<N;j++)
			{
				*(stu+j)=*(stu+j+1);
			}
		}
	}
	output();
	printf("Continue?\n");
	again2:
		scanf("%s",y);
		if(strcmp(y,"yes")==0) del(stu);
		else if(strcmp(y,"no")==0)
		{
			N=i;
			menu();
		}
		else
		{
			printf("wrong input\n");
			goto again2;
		}
}
void sel(struct stu_info* stu)
{
	char key[10];char y[5];int e=1,i;
	scanf("%s",key);
	for (i=0;i<N;i++)
	{
		if(strcmp((stu+i)->num,key)==0||strcmp((stu+i)->name,key)==0)
		{
			e=0;
			printf("%s %d %s %.1f %.1f %.1f\n",stu[i].num,stu[i].cls,stu[i].name,stu[i].maths,stu[i].physics,stu[i].english);
		}
	}
	if(e) printf("there is no eligible student\n");
	printf("Continue?\n");
	again3:
		scanf("%s",y);
		if(strcmp(y,"yes")==0) sel(stu);
		else if(strcmp(y,"no")==0)
		{
			menu();
		}
		else
		{
			printf("wrong input\n");
			goto again3;
		}
}
void order()
{
	sort(stu,N);
	output();
	menu();
}
void menu()
{
	int in;
	printf("1.input\n");
	printf("2.delete\n");
	printf("3.select\n");
	printf("4.order\n");
	printf("5.output\n");
	printf("6.quit\n");
	printf("please input your option\n");
	scanf("%d",&in);
	switch(in)
	{
		case(1):
			input();
			break;
		case(2):
			del(stu);
			break;
		case(3):
			sel(stu);
			break;
		case(4):
			order();
			break;
		case(5):
			output();
			menu();
			break;
		case(6):
			exit(0);
		default:
			printf("Wrong input\n");
	}
}
int main()
{
	menu();
	return 0;
}