Mid-term 2021

main.c

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

char *cau_10(char mssv[])
{
    int n;
    printf("Nhap tham bien n: ");
    scanf("%d", &n);
    int m = n % 1000;

    printf("Cac cap so thoa man la:\n");
    for (int y = 0; y * y <= m; y++)
    {
        printf("(%d, %d)\n", m - y * y, y);
        if (y != 0)
        {
            printf("(%d, -%d)\n", m - y * y, y);
        }
    }

    return mssv;
}

int isNext(int stack)
{
    char next;
    if (stack == 0)
    {
        scanf("%c", &next);
        return isNext(stack + 1);
    }
    printf("\nBan co muon tiep tuc nua hay khong? (y/n)? ");
    scanf("%c", &next);
    if (next == 'y' || next == 'Y')
    {
        return 1;
    }
    else if (next == 'n' || next == 'N')
    {
        return 0;
    }
    else
    {
        printf("Ban da nhap sai cu phap vui long thu lai!");
        return isNext(stack);
    }
}

void cau_5(char mssv[])
{
    double n;
    printf("Nhap tham bien n: ");
    scanf("%lf", &n);

    int m = (int)round(cbrt(n));
    if (m % 2 == 0) {
        m = m - 1;
    }
    int ssh = (m - 1) / 2 + 1;
    int sum = (m + 1) * ssh / 2;
    printf("Tong day so tu 1 -> %d la: %d", m, sum);
}

void cau_1(char hvt[])
{
    int bytes[strlen(hvt)];
    int sum = 0;
    hvt[strlen(hvt) - 1] = '\0';
    printf("Ho va ten: %s", hvt);
    for (int i = 0; i < strlen(hvt); i++)
    {
        char charAt = hvt[i];
        bytes[i] = hvt[i];
        printf("\n");
        if (bytes[i] % 2 == 0)
        {
            sum += bytes[i];
        }
        char input[2] = " ";
        while (input[0] != charAt)
        {
            printf("Nhap lai ki tu %c: ", charAt);
            scanf("%s", input);
            if (input[0] != charAt)
            {
                printf("Nhap sai vui long nhap lai!\n");
            }
        }
    }

    printf("\nDay so tuong ung voi ho va ten la: ");
    for (int i = 0; i < strlen(hvt); i++)
    {
        printf("%d ", bytes[i]);
    }
    printf("\nTong cua cac so chan la: %d", sum);
}

int main()
{
    char hvt[30];
    char mssv[20];
    printf("Ho ten sinh vien: ");
    fgets(hvt, 30, stdin);
    printf("Ma so sinh vien: ");
    fgets(mssv, 20, stdin);

    int canContinue = 1;
    while (canContinue == 1)
    {
        char input;
        printf("\e[1;1H\e[2J");
        printf("Lua chon 1: Bai so 10\n");
        printf("Lua chon 2: Bai so 5\n");
        printf("Lua chon 3: Bai so 1\n");
        printf("Nhap lua chon cua ban: ( 1 | 2 | 3 ): ");
        scanf("%c", &input);

        switch (input)
        {
        // Cau 10
        case '1':
            cau_10(mssv);
            canContinue = isNext(0);
            break;
        // Cau 5
        case '2':
            cau_5(mssv);
            canContinue = isNext(0);
            break;
        // Cau 1
        case '3':
            cau_1(hvt);
            canContinue = isNext(0);
            break;

        default:
            printf("Ban da nhap sai vui long thu lai");
            break;
        }
    }
}