How to take discount calculation

user11007886 :

Very new to programming. I would want the user to receive a 10% discount if he/she is over 60 (age>60) and 5% discount if he/she is between over 55 and equal to 60. (60<=age>55). I know that my code is completely wrong, but I would like to fix this step by step if possible.

import java.util.*;
public static void main(String[] args) {

Scanner input = new Scanner(System.in);
int price, age;
double tax, payAmount;
double discountRate_56_to_60 = 0.05;
double discountRate_60_above = 0.1;
payAmount = price * tax;

System.out.print("Price?");
price = input.nextInt();

System.out.print("Tax(%)?");
tax = input.nextDouble();

System.out.print("Age?");
age = input.nextInt();

System.out.println("You pay: $");
payAmount = input.nextDouble();

if (age > 55) {
    payAmount;
}
else if (age >= 60) {
    payAmount;
}

}
}

Malte Kölle :

There are multiple problems, the first one is that the second if statement else if (age >= 60) is never reached, because if the age is over 60 the person is also over 55. To solve that you should change the statements like this:

if(age >+ 60){
   // do something
} else if(age >= 55){
   // do something different
}

Then you try to initialize payAmount before you have initialized price and tax. You should to the calculation after the User entered his age and the price etc.

// User enters all the stuff
payAmount = price * tax;

And then you can apply the right discount rate in the if statements.

And if I would be you I would declare the Integer price as a Double, because it could be that the price is like 16.50$.

Also you could check if the entered number is an integer or a double to avoid exceptions.