C++ Final Assignment 3

#include <stdio.h>
#include <conio.h>
#include <ctype.h>

int choice;

void hienMenu(){

    printf("\n*****Arithmetic Program*****");
    printf("\n         1.Add");
    printf("\n         2.Subtract");
    printf("\n         3.Multiply");
    printf("\n         4.Devide");
    printf("\n         5.Quit");
}

void tinhtoan(){
    float x,y;
    printf("\nEnter the first number: "); scanf("%f", &x);
    printf("\nEnter the second number: "); scanf("%f", &y);

    switch(choice){
        case 1:
            printf("\nThe result %.0f + %.0f is %.6f", x,y,x+y); break;
        case 2:
            printf("\nThe result %.0f - %.0f is %.6f", x,y,x-y); break;
        case 3:
            printf("\nThe result %.0f x %.0f is %.6f", x,y,x*y); break;
        case 4:
            printf("\nThe result %.0f : %.0f is %.6f", x,y,x/y); break;
    }
}

int main(){

    do{
        hienMenu();
        printf("\nPlease enter your choice (1-5): ");
        scanf("%d", &choice);

        switch(choice){
            case 1: tinhtoan(); break;
            case 2: tinhtoan(); break;
            case 3: tinhtoan(); break;
            case 4: tinhtoan(); break;
            case 5: return 0; break;
        }
        fflush(stdin);

        if(choice>=1&&choice<=5){
            printf("\nContinue? (Y/N) ");

            char choice2 = getchar();

            switch(tolower(choice2)){
                case 'y': break;
                case 'n': return 0; break;
                default: break;
            }
        }
        else{
            printf("\nIncorect!\n");
        }

    }while(choice!=5);

    getch();
    return 0;
}