qjrxjglxt/a8.c

#include <stdio.h>
#include <string.h>
struct stu {
    char num[6];
    char class[3];
    char name[6];
    float grade1;
    float grade2;
    float grade3;
    float grade;
}s[10],ss;

int main()
{
    int bb=0;
	while(1)
{
	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 intput your option\n");
	int input;
	scanf("%d",&input);
	if(input==1)
	{
		char ch[6];
		int i=0;
		while(1)
		{
			printf("Id ");
			scanf("%s",s[i].num);
			printf("class ");
			scanf("%s",s[i].class);
			printf("name ");
			scanf("%s",s[i].name);
			printf("score1 ");
			scanf("%f",&s[i].grade1);
			printf("score2 ");
			scanf("%f",&s[i].grade2);
			printf("score3 ");
			scanf("%f",&s[i].grade3);
			printf("continue?\n");
			i++;
			
			for(int j=0;j<i;j++)
	{
		s[i].grade=s[i].grade1+s[i].grade2+s[i].grade3;
	}
	        scanf("%s",ch);
			if(strcmp(ch,"no")==0)
			break;
		}
	}
	else if(input==2)
	{
		bb=1;
		char de[6];
		while(1)
		{
		scanf("%s",de);
		for(int i=0;i<3;i++)
		{
			if(strcmp(s[i].num,de)==0&&i<2)
			{
				for(int j=i;j<2;j++)
				s[j]=s[j+1];
			}
		}
		for(int i=0;i<2;i++)
		{
			printf("%s %s %s %.1f %.1f %.1f\n",s[i].num,s[i].class,s[i].name,s[i].grade1,s[i].grade2,s[i].grade3);
		}
		printf("continue?\n");
		char ch[6];
		scanf("%s",ch);
		if(strcmp(ch,"no")==0)
		break;
	    }
	}
	else if(input==3)
	{
		char in[6];
		int aa=0;
	    while(1)
	    {
		scanf("%s",in);
		for(int i=0;i<2;i++)
		{
		if(strcmp(in,s[i].num)==0||strcmp(in,s[i].class)==0)
		{
			printf("%s %s %s %.1f %.1f %.1f\n",s[i].num,s[i].class,s[i].name,s[i].grade1,s[i].grade2,s[i].grade3);
			aa=1;
		}
	    }
	    if(aa==0)
	    printf(" there is no eligible student");
	    printf("continue?\n");
		char ch[6];
		scanf("%s",ch);
		if(strcmp(ch,"no")==0)
		break;
	    }
	}
	else if(input==4)
	{
		if(bb==0)
		{
		strcpy(s[0].num,"10001");strcpy(s[0].class,"11");strcpy(s[0].name,"zhang");s[0].grade1=99.5;s[0].grade2=88.5;s[0].grade3=89.5;s[0].grade=277.5;
	    strcpy(s[2].num,"10003");strcpy(s[2].class,"11");strcpy(s[2].name,"wang");s[2].grade1=92.5;s[2].grade2=99.0;s[2].grade3=60.5;s[2].grade=252.0;
	    strcpy(s[1].num,"10002");strcpy(s[1].class,"22");strcpy(s[1].name,"li");s[1].grade1=77.9;s[1].grade2=56.5;s[1].grade3=87.5;s[1].grade=221.9;
	    for(int i=0;i<2;i++)
	    {
	    for(int j=i+1;j<3;j++)
	    {
	    	if(strcmp(s[i].class,s[j].class)>0)
	    	{
	    		ss=s[i];
	    		s[i]=s[j];
	    		s[j]=ss;
			}		
		}
	    }
	    for(int i=0;i<1;i++)
	    {
	    for(int j=i+1;j<2;j++)
	    {
	    	if(s[i].grade<s[j].grade)
	    	{
	    		ss=s[i];
	    		s[i]=s[j];
	    		s[j]=ss;
			}		
	  	}
	    }
	    
	    }
	}
	else if(input==5)
	{
		if(bb=0)
		{
		for(int i=0;i<4;i++)
	    {
	    	printf("%s %s %s %.1f %.1f %.1f %.1f\n",s[i].num,s[i].class,s[i].name,s[i].grade1,s[i].grade2,s[i].grade3,s[i].grade);
		}
	    }
	    else
	    {
	    	for(int i=0;i<2;i++)
	    {
	    	printf("%s %s %s %.1f %.1f %.1f %.1f\n",s[i].num,s[i].class,s[i].name,s[i].grade1,s[i].grade2,s[i].grade3,s[i].grade);
		}
		}
	}
	else if(input==6)
	break;
}
	return 0;
}