simple homework

main.c

/*
 Author : helloqiu
 Description: A simple homework.
 
 P.S. You should do it yourself. QAQ
 */
#include <stdio.h>
#include <stdlib.h>
struct Student{
    int id;
    char name[20];
    int score[4];
};
typedef struct Student student;

void count(student* man[]);
void total(student* man[]);
void average(student* man[]);
int totalScore(student* man);

int num = 0;

int main(void){
    
    printf("Please enter the number of the students:\n");
    scanf("%d" , &num);
    student* man[num];
    for (int i = 0 ; i < num ; i ++){
        man[i] = malloc(sizeof(student));
        printf("Input student %d:\n" , i + 1);
        printf("Number:");
        scanf("%d" , &(man[i] -> id));
        printf("Name:");
        scanf("%s" , &(man[i] -> name[0]));
        printf("Score:\n");
        for (int j = 0 ; j < 4 ; j ++){
            printf("Course %d:" , j + 1);
            scanf("%d" , &(man[i] -> score[j]));
        }
    }
    while (1){
        printf("Enter the command:\n");
        int tmp;
        scanf("%d" , &tmp);
        switch(tmp){
            case 0:
                return 0;
            case 1:
                count(man);
                continue;
            case 2:
                total(man);
                continue;
            case 3:
                average(man);
                continue;
        }
    }
}
void count(student* man[]){
    for (int j = 0 ; j < 4 ; j ++){
        int ex = 0;
        int good = 0;
        int medium = 0;
        int pass = 0;
        int not_pass = 0;
        for (int i = 0 ; i < num ; i ++){
            if (man[i] -> score[j] >= 60){
                pass += 1;
            }
            if (man[i] -> score[j] < 60){
                not_pass += 1;
            }
            if (man[i] -> score[j] >= 90){
                ex += 1;
                continue;
            }
            if (man[i] -> score[j] >= 80){
                good += 1;
                continue;
            }
            if (man[i] -> score[j] >= 70){
                medium += 1;
                continue;
            }
            
            
        }
        printf("Course %d\n" , j + 1);
        printf("Excellent:\n%d\n" , ex);
        printf("Good:\n%d\n" , good);
        printf("Medium:\n%d\n" , medium);
        printf("Pass:\n%d\n" , pass);
        printf("Not Pass:\n%d\n" , not_pass);
    }
}
void total(student* man[]){
    int order[num];
    for (int i = 0 ; i < num ; i ++){
        order[i] = i;
    }
    for(int i = 0 ; i < num  - 1; i ++){
        for (int j = i + 1 ; j < num ; j ++){
            if (totalScore(man[order[i]]) < totalScore(man[order[j]])){
                int tmp = order[i];
                order[i] = order[j];
                order[j] = tmp;
            }
        }
    }
    for (int i = 0 ; i < num ; i ++){
        printf("Name:%s\n" , man[order[num - i - 1]] -> name);
        printf("Total:%d\n" ,totalScore(man[order[num - i - 1]]));
    }
}
void average(student* man[]){
    for (int i = 0 ; i < 4 ; i ++){
        int tmp = 0;
        for (int j = 0 ; j < num ; j ++){
            tmp += man[j] -> score[i];
        }
        printf("Course %d:\n" , i + 1);
        printf("%.1f\n" , tmp * 1.000 / num);
    }
}
int totalScore(student* man){
    int tmp = 0;
    for (int i = 0 ; i < 4 ; i ++){
        tmp += man -> score[i];
    }
    return tmp;
}