What's wrong with my code?

Code:

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

main()
{
    char additional;
    float vm1=50,vm2=75,vm3=40,price,totalamount,payment,change;
    int order,quantity;   
    
    printf("Menu\n\n[1] VM1 Chicken and stuffs 50.00\n[2] VM2 Hamburger and stuffs 75.00\n[3] VM3 etc and stuffs 40.00\n");
    additional='y';
    while(additional=='y'||additional=='Y')
    {
       printf("\nEnter the menu number of your order: ");
       scanf("%d",&order);
       switch(order)
          {
                    case 1:
                         price=vm1;
                         break;
                    case 2:
                         price=vm2;
                         break;
                    case 3:
                         price=vm3;
                         break;
                    default:
                         printf("Not available");
                         price=0;
                         goto ao;
                         break;
          }         
       printf("\nHow many order: ");
       scanf("%d",&quantity);
       totalamount=price*quantity;      
    ao:    
     printf("\nIs there any additional order?\nY = yes N = no\nAnswer: ");
       scanf("%s",&additional); 
       if(price=0&&additional=='n')
       {
       exit(0);
           }
     }    
     printf("\nHow much is your money: ");
     scanf("%f",&payment);
     change=payment-totalamount;
     printf("\nYour total bill is %.2f\nYour money is %.2f\nYour change is %.2f",totalamount,payment,change);
     getch();

}

Ok, so I found well, in a quick research that if you use exit(0); then my program will terminate. But it ain't working. So what is wrong with my code?


EDIT: Never mind. I already solve the problem.