xueji/step8

#include<stdio.h>
#include<string.h> 
struct Student
{
	char id[20];
	char Class[20];
	char name[50];
	float gs;
	float dw;
	float yy;
	float all;
};
struct Student stu[20];
int n=0;
void menu()
{
	printf("1.input\n");
	printf("2.delect\n");
	printf("3.select\n");
	printf("4.order\n");
	printf("5.output\n");
	printf("6.quit\n");
	printf("please input your optition\n");
}
void print()
{
	int i=0;
	for(i;i<n;i++)
	{
		printf("%s,%s,%s,%.1f,%.1f,%.1f,%.1f\n",stu[i].id,stu[i].Class,stu[i].name,stu[i].gs,stu[i].dw,stu[i].yy,stu[i].all);
	}
}
void input()//
{
	char ch[20];//chioce选择是否进行继续input操作
	int i=1;
	while(i=1)
	{
	 printf("Id:");
	 scanf("%s",&stu[n].id);
	 printf("Class:");
	 scanf("%s",&stu[n].Class);
	 printf("Name:");
	 scanf("%s",&stu[n].name);
	 printf("score1:");
	 scanf("%f",&stu[n].gs);
	 printf("score2:");
	 scanf("%f",&stu[n].dw);
	 printf("score3:");
	 scanf("%f",&stu[n].yy);
	 n++;
	 printf("continue?\n");
	 scanf("%s",ch);
	 if(strcmp(ch,"no")==0)
	 {
	 	i=0;
	 	return;
	 }
	 else 
	 {
	 	i=1;
	 	ch[20]='\0';//将choice数组中的字符清零以便进行下一次的判断
	 }
	 } 
}
void del()
{
	int i,d;
	char key[20],op[20];
	while(1)
	{
		i=0,d=0;
		scanf("%s",key);
		while(i<n)
		{
			if(strcmp((stu+i)->id,key)==0||strcmp((stu+i)->name,key)==0)
			{
				d++;n--;
				*(stu+i)=*(stu+i+d);
			}
			else
			{
				*(stu+i)=*(stu+i+d);
				i++;
			}
		}
		print();
		printf("continue?\n");
		do{
			scanf("%s",op);
		}while(strcmp(op,"yes")!=0&&strcmp(op,"no")!=0);
		if(strcmp(op,"no")==0) return;
	}
}

void select()
{
	int i,j;
	char key[20],op[20];
	while(1)
	{
		j=0;
		scanf("%s",key);
		for(i=0;i<n;i++)
		{
				if(strcmp((stu+i)->id,key)==0||strcmp((stu+i)->Class,key)==0)
			{
				j=1;
				printf("%s,%s,%s,%.1f,%.1f,%.1f,%.1f\n",stu[i].id,stu[i].Class,stu[i].name,stu[i].gs,stu[i].dw,stu[i].yy,stu[i].all);
			}
		}
		if(j==0)
		{
			printf("there is no eligible student\n");
			return;
		}
			printf("continue?\n");
	do
	{
		scanf("%s",op);
	}
	while(strcmp(op,"yes")!=0&&strcmp(op,"no")!=0);
	if(strcmp(op,"no")==0) return;
	}
}
void order()
{
	int i,j;
	struct Student swap;
	for(i=0;i<n;i++)//对班级排序 
	{
		for(j=0;j<n-i-1;j++)
		{
			if(strcmp((stu+j)->Class,(stu+j+1)->Class)==1||(strcmp((stu+j)->Class,(stu+j+1)->Class)==0)&&stu[j].all<stu[j].all)
			{
				swap=*(stu+j);
				*(stu+j)=*(stu+j+1);
				*(stu+j+1)=swap;
			}
		}
	}
	print();
	return ;
}
int main()
{
	int choice;
	while(1)
	{
	  menu();
	  scanf("%d",&choice);
	  switch(choice)
	  {
	  	case 1:input();break;
	  	case 2:del();break;
	  	case 3:select();break;
	  	case 4:order();break;
	  	case 5:print();break;
	  	case 6:return 0;
	  }
    }
}