How to convert int to decimal fraction? - Java

Question

I have such code:

int number1 = 20;
int number2 = number1/100;

I want to get percentage of number1 as 0,2 -> I suppose int should be converted into some other type. But I need 0,2 to use for BigDecimal number. How can I get this 0,2 from int number1 = 20?

int number1 = 20 has to be in that type.

Will be grateful for help.

But the result is still 0.0 when I make number2 the double... — JeyKey, Oct 30 '17 at 14:01
"I need 0,2 to use for BigDecimal number." no, you don't. If anything, you can create big decimal directly from `0.2`. — M. Prokhorov, Oct 30 '17 at 14:01
@JeyKey you need to divide by a `double`. `100` isn't a `double`. `100.0` is. — Chai T. Rex, Oct 30 '17 at 14:29

score 2 · Accepted Answer · answered Oct 30 '17 at 14:03

Using a BigDecimal is appropriate here. You can use BigDecimal.valueOf in order to convert int to BigDecimal. Then, you can divide by specifying a scale and a rounding mode.

Example :

System.out.println(
BigDecimal.valueOf(20).divide(BigDecimal.valueOf(100), 1, RoundingMode.HALF_UP)
);

Will display :

0.2

With a different scale :

System.out.println(
BigDecimal.valueOf(20).divide(BigDecimal.valueOf(100), 2, RoundingMode.HALF_UP)
);

It will display :

0.20

Or like stated in the question comments, you can also create directly the BigDecimal from a String :

System.out.println(new BigDecimal("0.2"));

score 0 · Answer 2 · answered Oct 30 '17 at 14:01

0

Divide the int by a floatvalue to give to it a floating number representation and assign it to a floating number.

float number2 = number1/100F;

answered Oct 30 '17 at 14:01

davidxxx

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How to convert int to decimal fraction? - Java

2 Answers2