CODEWITHSUNDEEP
java
G. Martyna
G. Martyna

Reputation: 35

How do I get division operator to round down double value?

(COMPLETE newbie here). I've got an extra sheet with simple exercises to complete. One of the exercises says to write a program where user can input a random amount of money and the program tells the user how many euros, 50 cents, 20 cents, 10 cents, 5 cents, 2 cents and 1 cents are needed to make up the amount entered. I try to use the modulus to get the amount of cents needed,

My question is how do I get my program to calculate the number of CENTS needed? Everytime I use division operator to get the number of 50 cents needed on the remainder of the amount (ex. 0.60) it rounds the double up giving me 2 as output.

Scanner keyboard = new Scanner(System.in);

System.out.print("Input money recieved: ");
double recieve = keyboard.nextDouble();

double cents = recieve * 100;

int centsTotal = (int)cents;

System.out.print("Cents in total " + centsTotal);

int notes = centsTotal / 100;

System.out.print("\nEuros: " + notes);

double remain = recieve % notes;

System.out.printf("\nRemain: %.2f",remain);

double remain2 = remain / 0.5;

System.out.println("\nTest: ",remain2);

My output is: 

Input money recieved: 45,78
    Cents in total 4578
    Euros: 45
    Remain: 0,78
    Test: 1.5600000000000023

Upvotes: 2

Views: 1769

Answers (2)

NonCreature0714
NonCreature0714

Reputation: 6014

One way is maybe a little brutal, but memory efficient (create no new object or variables). Simply cast your double to int to round down.

public class RoundingTest {
  public static void main(String[] args) {
    double num = 1.56;
    System.out.println("Test: " + (int)num);
  }
}

Outputs:

Test: 1

This also allows you to keep your original double untouched for further calculation if needed.

Upvotes: 0

ahjohnston25
ahjohnston25

Reputation: 1975

You can cheat by using the Math.round() function like so:

double roundOff = Math.round(valueToRound * 100.0) / 100.0;

This ensures that you keep the value as a double, which allows you to do further operations on it if necessary.

Upvotes: 1

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