forget c

student.c

#include<stdio.h>
#include<stdlib.h>
#define MAX 100

int choice=1, count=0;
double scores[MAX][6];

int notify() {
    printf("\nYou can do:\n [1]: Input a Student Score\t[2]: Print Students Scores\t[3]: Sort Students Scores\t[4]:Exit\n>>> ");
    scanf("%d", &choice);
    return 1;
}

int inputScore() {
    if(count >= MAX) {
        printf("Sorry, you need buy a larger storage. Will you buy it?");
        return 0;
    }
    printf("Student NO: ");
    scanf("%lf", &scores[count][0]);
    printf("Chinese Score: ");
    scanf("%lf", &scores[count][1]);
    printf("Math Score: ");
    scanf("%lf", &scores[count][2]);
    printf("Computer Score: ");
    scanf("%lf", &scores[count][3]);
    scores[count][4] = scores[count][1] + scores[count][2] + scores[count][3];
    scores[count][5] = scores[count][4] / 3;
    count += 1;
    return 1;
}

void printScore() {
    int i = 0;
    printf("NO.\tChinese\t\tMath\t\tComputer\tTotal\t\tAverage\n");
    while (i < count) {
        printf("%0.0f\t%0.1f\t\t%0.1lf\t\t%0.1lf\t\t%0.1lf\t\t%0.1lf\n", scores[i][0], scores[i][1], scores[i][2], scores[i][3], scores[i][4], scores[i][5]);
        i += 1;
    }
}

void sortScore() {
    int sortIndex[count];
    int i, j, tmp;
    for (i=0; i < count; i++) {
        sortIndex[i] = i;
    }
    // bubble sort
    for (i=0; i < count; i++) {
        for(j=0; j < count-1; j++) {
            if(scores[j][5] < scores[j+1][5]) {
                tmp = sortIndex[j+1];
                sortIndex[j+1] = sortIndex[j];
                sortIndex[j] = tmp;
            }
        }
    }
    printf("NO.\tChinese\t\tMath\t\tComputer\tTotal\t\tAverage\n");
    j = 0;
    while (j < count) {
        i = sortIndex[j];
        printf("%0.0f\t%0.1f\t\t%0.1lf\t\t%0.1lf\t\t%0.1lf\t\t%0.1lf\n", scores[i][0], scores[i][1], scores[i][2], scores[i][3], scores[i][4], scores[i][5]);
        j += 1;
    }
}

int main() {
    printf("Welcome to Student Score System\n");
    while (choice != 4) {
        notify();
        if (choice == 1) {
            inputScore();
        } else if (choice == 2) {
            printScore();
        } else if (choice == 3) {
            sortScore();
        }
    }
    printf("\nThanks, goodbye. Have a nice day.");
    return choice;
}

For whom was this homework written ? ;p