Convert decimal to whole number in java

Question

I need to separate the whole number and decimal value. Representing both values as whole numbers.

For example, 1.24 would output:

Whole number: 1 Decimal: 24

How are you getting the value to be converted? Is the input actually a `double` or a `String` or do you have to read user input, or what? — azurefrog, Sep 13 '19 at 21:31

score 0 · Answer 1 · answered Sep 13 '19 at 22:59

Assuming that your input is String. You can use just use split and separate out the decimal and whole part. Though beware of Floating Point Precision Error.

See: Is floating point math broken?

If you want to be really precise. Use BigDecimal instead.

String decimalString = "46.88999999999999";
String[] decimalSplit = decimalString.split("\\.");
System.out.println("Decimal Number: " + decimalString);
System.out.println("Whole Number: " + decimalSplit[0]);
System.out.println("Decimal Part: " + decimalSplit[1]);

int wholePart = Integer.parseInt(decimalSplit[0]);
double decimalPart = Double.parseDouble("." + decimalSplit[1]);
System.out.println("\nWhole Part: " + wholePart);
System.out.println("Decimal Part: " + decimalPart);

Output:

Decimal Number: 46.88999999999999
Whole Number: 46
Decimal Part: 88999999999999

Whole Part: 46
Decimal Part: 0.88999999999999

@MarcusJones Does this answer work for you? – Yoshikage Kira Sep 14 '19 at 09:29 — Yoshikage Kira, Sep 14 '19 at 09:29

Convert decimal to whole number in java

1 Answers1