xjxt/xjxt8.cpp

#include <stdio.h>
#include <string.h>
#define MAX_STUDENTS 100
typedef struct 
{
    char id[20];
    char mclass[20];
    char name[20];
    float score1, score2, score3;
} Student;
int numStudents=0;  // ¼Ç¼µ±Ç°Ñ§ÉúµÄÊýÁ¿
Student students[MAX_STUDENTS];
void showMenu()
{
		printf("%30s1.input\n", " ");
    	printf("%30s2.delete\n", " ");
    	printf("%30s3.select\n", " ");
    	printf("%30s4.order\n", " ");
        printf("%30s5.output\n", " ");
        printf("%30s6.quit\n", " ");
        printf("%30splease input your option\n", " ");

}
void insertStudent() 
{
    
    printf("ID ");
    scanf("%s", students[numStudents].id);
    printf("class: ");
    scanf("%s", &(students[numStudents].mclass));
    printf("name: ");
    scanf("%s", students[numStudents].name);
    printf("score1: ");
    scanf("%f", &(students[numStudents].score1));
    printf("score2: ");
    scanf("%f", &(students[numStudents].score2));
    printf("score3: ");
    scanf("%f", &(students[numStudents].score3));
    numStudents++;
}

void deleteStudent() 
{
    char idOrName[20];
    scanf("%s", idOrName);
    int i, j;
    int found = 0;
    for (i = 0; i < numStudents; i++) 
	{
        if (strcmp(students[i].id, idOrName) == 0 || strcmp(students[i].name, idOrName) == 0) 
		{
			found = 1;
            for (j = i; j < numStudents - 1; j++) 
			{
                students[j] = students[j + 1];
            }
            numStudents--;
            break;
        }
    }
    for ( i = 0; i < numStudents; i++)
    {
        printf("%s %s %s %.1f %.1f %.1f\n", students[i].id, students[i].mclass, students[i].name, students[i].score1, students[i].score2, students[i].score3);
    }
}
void selectStudent()
{
	char idOrName[20];
	scanf("%s", idOrName);
	int i,j;
	int f=0;
    for (i = 0; i < numStudents; i++) 
	{
        if (strcmp(students[i].id, idOrName) == 0 || strcmp(students[i].name, idOrName) == 0) 
		{
			f=1;
            printf("%s %s %s %.1f %.1f %.1f\n", students[i].id, students[i].mclass, students[i].name, students[i].score1, students[i].score2, students[i].score3);
        }
	}
	if(f==0) printf("there is no eligible student\n");
}

void orderStudent()
{
	int i,j;
    for (i = 0; i < numStudents; i++) 
	{          
        for (j=i+1;j<numStudents;j++) 
		{  
             if (students[i].mclass > students[j].mclass || (students[i].mclass == students[j].mclass && students[i].score1 + students[i].score2 + students[i].score3 < students[j].score1 + students[j].score2 + students[j].score3)) 
			{
                    Student temp = students[j];
                    students[j] = students[i];
                    students[i] = temp;
            }
        }
    }
    for ( i = 0; i < numStudents; i++)
    {
        printf("%s %s %s %.1f %.1f %.1f\n", students[i].id, students[i].mclass, students[i].name, students[i].score1, students[i].score2, students[i].score3);
    }
}
void printStudent() 
{
	int i=0;
    for (i = 0; i < numStudents; i++) 
	{
        printf("%s %s %s %.1f %.1f %.1f\n", students[i].id, students[i].mclass, students[i].name, students[i].score1, students[i].score2, students[i].score3);
    }
}

int main() 
{
	int choice;
    char a[4];
    while (1) 
	{
		showMenu();
        scanf("%d", &choice);
        switch (choice) 
		{
            case 1:
                insertStudent();
                while(1)
                {
                	printf("continue?\n");
                	scanf("%s",&a);
                	if(strcmp(a,"yes")==0)
                	{
                		insertStudent();
                		continue;
					}
					else break;
				}
                break;
            case 2:
                deleteStudent();
                while(1)
                {
                	printf("continue?\n");
                	scanf("%s",&a);
                	if(strcmp(a,"yes")==0)
                	{
                		deleteStudent();
                		continue;
					}
					else break;
				}
                break;
            case 3:
                selectStudent();
                while(1)
                {
                	printf("continue?\n");
                	scanf("%s",&a);
                	if(strcmp(a,"yes")==0)
                	{	
                		selectStudent();
                		continue;
					}
					else break;
				}
                break;
            case 4:
                orderStudent();
                break;
            case 5:
            	printStudent();
            	break;
            case 6:
                return 0;
        }
        //showMenu();
    }
}