HW9.1

#include <stdio.h>

#define BIT 32

void printBinary (int n) {
    int i;
    printf("\n%d o dang nhi phan: ", n);
    for (i = BIT - 1; i >= 0; --i) {
        printf("%d", (n >> i) & 1);

    }
    putchar('\n');
    return;
}

void printOctal (int n) {
    printf("\n%d o dang bat phan: ", n);
    printf("%o\n", n);
    return;
}

void printHexa (int n) {
    printf("\n%d o dang thap luc phan: ", n);
    printf("%X\n", n);
    return;
}

void Input (int &n) {
    int tmp;
    do {
        printf("Nhap so n: ");
        tmp = scanf("%d", &n);
        while (getchar() != '\n');
        if (tmp != 1) {
            printf("!!! Vui long nhap so nguyen n !!!\n");
        }
    } while (tmp != 1);
    return;
}

int main () {
    int n;
    int isInput = 0, isOut = 0, choice;
    // isInput = 0 : no input
    // isOut = 0 : have not out yet
    do {
        printf("--------------------------------\n");
        printf("Tac gia: %s\n\n", "Nguyen Duc Hung");
        printf("1. Nhap so (he 10)\n");
        printf("2. So o he nhi phan\n");
        printf("3. So o he thap luc phan\n");
        printf("4. So o he bat phan\n");
        printf("5. Thoat\n");
        printf("--------------------------------\nLua chon: ");
        scanf("%d", &choice);
        while (getchar() != '\n');
        switch (choice) {
            case 1:
                Input(n);
                isInput = 1;
                break;
            case 2:
                if (isInput)
                    printBinary(n);
                else
                    printf("!!! Ban chua nhap so n !!!\n");
                break;
            case 3:
                if (isInput)
                    printHexa(n);
                else
                    printf("!!! Ban chua nhap so n !!!\n");
                break;
            case 4:
                if (isInput)
                    printOctal(n);
                else
                    printf("!!! Ban chua nhap so n !!!\n");
                break;
            case 5:
                isOut = 1;
                break;
            default:
                printf("!!! Lua chon khong hop le !!!\n");
        }
    } while (!isOut);
    return 0;
}