lab2/program 8.c

#include<stdio.h>
#include<string.h> 
int top=0;
struct stu
{
	char num[20];
	char c[20];
	char name[20];
	float m,p,e,s;
}stu[100];

void first()
{
	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");
}


void a5()
{
	int i;
	for(i=0;i<top;i++) printf("%s,%s,%s,%.1f,%.1f,%.1f,%.1f\n",stu[i].num,stu[i].c,stu[i].name,stu[i].m,stu[i].p,stu[i].e,stu[i].s);
}
void a1()
{
	char n[20];
	while(1)
	{
		printf("Id ");
		scanf("%s",stu[top].num);
		printf("class ");
		scanf("%s",&stu[top].c);
		printf("name ");
		scanf("%s",stu[top].name);
		printf("score1 ");
		scanf("%f",&stu[top].m);
		printf("score2 ");
		scanf("%f",&stu[top].p);
		printf("score3 ");
		scanf("%f",&stu[top].e);
		stu[top].s=stu[top].m+stu[top].p+stu[top].e;
		top++;
		printf("continue?\n");
		do{
			scanf("%s",n);
		}while(strcmp(n,"yes")!=0&&strcmp(n,"no")!=0);
		if(strcmp(n,"no")==0) return;
	}
}

void a2()
{
	int i,d;
	char key[20],n[20];
	while(1)
	{
		i=0,d=0;
		scanf("%s",key);
		while(i<top)
		{
			if(strcmp((stu+i)->num,key)==0||strcmp((stu+i)->name,key)==0)
			{
				d++;top--;
				*(stu+i)=*(stu+i+d);
			}
			else
			{
				*(stu+i)=*(stu+i+d);
				i++;
			}
		}
		a5();
		printf("continue?\n");
		while(strcmp(n,"yes")!=0&&strcmp(n,"no")!=0);{
			scanf("%s",n);
		}
		if(strcmp(n,"no")==0) return;
	}
}

void a3()
{
	int i,flag;
	char key[20],n[20];
	while(1)
	{
		flag=0;
		scanf("%s",key);
		for(i=0;i<top;i++)
		{
			if(strcmp((stu+i)->num,key)==0||strcmp((stu+i)->c,key)==0)
			{
				flag=1;
				printf("%s,%s,%s,%.1f,%.1f,%.1f,%.1f\n",stu[i].num,stu[i].c,stu[i].name,stu[i].m,stu[i].p,stu[i].e,stu[i].s);
			}
		}
		if(!flag)
		{
			printf("there is no eligible student\n");
			return;
		}
		printf("continue?\n");
		do{
			scanf("%s",n);
		}while(strcmp(n,"yes")!=0&&strcmp(n,"no")!=0);
		if(strcmp(n,"no")==0) return;
	}
}

void a4()
{
	int i,j;
	struct stu t;
	for(i=0;i<top;i++)
	{
		for(j=0;j<top-i-1;j++)
		{
			if(strcmp((stu+j)->c,(stu+j+1)->c)==1||strcmp((stu+j)->c,(stu+j+1)->c)==0&&((stu+j)->s<(stu+j+1)->s))
			{
				t = *(stu+j);
				*(stu+j) = *(stu+j+1);
				*(stu+j+1) = t;
			} 
		}
	}
	a5();
	return;
}

int main()
{
	int n;
	while(1)
	{
		first();
		scanf("%d",&n);
		switch(n)
		{
			case(1):
				a1();
				break;
			case(2):
				a2();
				break;
			case(3):
				a3();
				break;
			case(4):
				a4();
				break;
			case(5):
				a5();
				break;
			case(6):
				return 0;
		}
	}
}