xjxt/xjxtfff.cpp

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

typedef struct Student {
    char id[20];
    char mclass[20];
    char name[20];
    float score1, score2, score3;
    struct Student* next;
} Student;

Student* head = NULL; // Í·½ÚµãÖ¸Õë

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() {
    Student* newStudent = (Student*)malloc(sizeof(Student));
    printf("ID: ");
    scanf("%s", newStudent->id);
    printf("class: ");
    scanf("%s", newStudent->mclass);
    printf("name: ");
    scanf("%s", newStudent->name);
    printf("score1: ");
    scanf("%f", &newStudent->score1);
    printf("score2: ");
    scanf("%f", &newStudent->score2);
    printf("score3: ");
    scanf("%f", &newStudent->score3);
    newStudent->next = head;
    head = newStudent;
}

void printStudent() {
    Student* current = head;
    while (current != NULL) {
        printf("%s %s %s %.1f %.1f %.1f\n", current->id, current->mclass, current->name, current->score1, current->score2, current->score3);
        current = current->next;
    }
}

void deleteStudent() {
    char idOrName[20];
    scanf("%s", idOrName);
    Student* current = head;
    Student* prev = NULL;
    while (current != NULL) {
        if (strcmp(current->id, idOrName) == 0 || strcmp(current->name, idOrName) == 0) {
            if (prev == NULL) {
                head = current->next;
            } else {
                prev->next = current->next;
            }
            free(current);
            break;
        }
        prev = current;
        current = current->next;
    }
    printStudent();
}



void selectStudent() {
    char idOrName[20];
    scanf("%s", idOrName);
    Student* current = head;
    int found = 0;
    while (current != NULL) {
        if (strcmp(current->id, idOrName) == 0 || strcmp(current->name, idOrName) == 0) {
            printf("%s %s %s %.1f %.1f %.1f\n", current->id, current->mclass, current->name, current->score1, current->score2, current->score3);
            found = 1;
        }
        current = current->next;
    }
    if (found == 0) {
        printf("There is no eligible student\n");
    }
}


void orderStudent() 
{
    Student *ptr1, *ptr2;
    Student tempStudent;
    
    if (head == NULL) {
        return;
    }
    
    for (ptr1 = head; ptr1->next != NULL; ptr1 = ptr1->next) {
        for (ptr2 = ptr1->next; ptr2 != NULL; ptr2 = ptr2->next) {
            if ((ptr1->mclass)>(ptr2->mclass)||((ptr1->mclass)==(ptr2->mclass)&&(ptr1->score1 + ptr1->score2 + ptr1->score3) < (ptr2->score1 + ptr2->score2 + ptr2->score3)))
			 {
                // ½»»»Á½¸öѧÉú½ÚµãµÄÊý¾Ý
                strcpy(tempStudent.id, ptr1->id);
                strcpy(tempStudent.mclass, ptr1->mclass);
                strcpy(tempStudent.name, ptr1->name);
                tempStudent.score1 = ptr1->score1;
                tempStudent.score2 = ptr1->score2;
                tempStudent.score3 = ptr1->score3;

                strcpy(ptr1->id, ptr2->id);
                strcpy(ptr1->mclass, ptr2->mclass);
                strcpy(ptr1->name, ptr2->name);
                ptr1->score1 = ptr2->score1;
                ptr1->score2 = ptr2->score2;
                ptr1->score3 = ptr2->score3;

                strcpy(ptr2->id, tempStudent.id);
                strcpy(ptr2->mclass, tempStudent.mclass);
                strcpy(ptr2->name, tempStudent.name);
                ptr2->score1 = tempStudent.score1;
                ptr2->score2 = tempStudent.score2;
                ptr2->score3 = tempStudent.score3;
            }
        }
    }
    printStudent();
}


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;
        }
    }
}