Question

In the code, I have

int a = 62;
int b = 132;
double c;
c = (double) a/b;
System.out.println(c);

which prints out the value of c as 0.469696968793869
How can I just keep a short format for c, like 0.4697

Answer 1

The correct way to keep (not print) a result of prescribed precision is to use the java.math.BigDecimal class as follows.

import java.math.BigDecimal;
import java.math.MathContext;
import java.math.RoundingMode;

public class Foo {

    private static final int PRECISION = 5;
    private static final MathContext MATH_CONTEXT = new MathContext(PRECISION, RoundingMode.HALF_UP);

    public static void main(String... args) {
        double a = 62;
        double b = 132; // Doubles used to avoid integer division truncation
        final BigDecimal c = new BigDecimal(a / b, MATH_CONTEXT);
        System.out.println(c); // Prints 0.46970
    }
}