Loan Calculator

Question

Hey. Ive been struggling with this one. Any ideas why I cant use int instead of double?
Expected behaviour is to reduce the remaining sum owed each iteration. This works when using double. When I convert everything to int it returns the same sum for each iteration.

import java.util.Scanner;

public class Program
{

public double calculatePercentage(double obtained, double percentage) {
// double 10percent = (double)(value*(percentage/100.0f));
double remainder = obtained - (double)(obtained*(percentage/100));
return remainder;
}

public static void main(String[] args) {

//instantiate the pc method
Program pc = new Program();

//take a input starting amount
Scanner scanner = new Scanner(System.in);
System.out.println("Enter an amount: ");
double obtained = scanner.nextDouble();

int i = 1;

do {
double remains = pc.calculatePercentage(obtained, 10.0);
System.out.println("The remaining amount of your loan is: " + remains);
obtained = pc.calculatePercentage(remains,10.0);
i++;
} while (i<3);

}

}

Answer 1

You need to use this way calculatePercentage method
if you use 100 instead of 100.0 then 10/100 = 0 that is why you get same print statement.
--------------------------------------------------------------------
public int calculatePercentage(int obtained, int percentage) {
int remainder = obtained - (int)(obtained*(percentage/100.0));
return remainder;
}

------------------------------------------------------------------------
Also you can use below code
import java.util.Scanner;
public class Test
{
public int calculatePercentage(int obtained, int percentage) {
int remainder = obtained - (int)(obtained*(percentage/100.0));
return remainder;
}
public static void main(String[] args) {
//instantiate the pc method
Test pc = new Test();
//take a input starting amount
Scanner scanner = new Scanner(System.in);
System.out.println("Enter an amount: ");
int obtained = scanner.nextInt();

int remainder = obtained;
for(int i = 0; i<3; i++){
remainder = pc.calculatePercentage(remainder, 10);
}
System.out.println(remainder);
}
}

Answer 2

Great jobs 👌👌👌