Given a floating-point number 100.899456
, how would you truncate it to just two decimals?
In other words, how would you convert that number to 100.89
?
You can do this in Java without using a function call. Here’s the algorithm:
- Multiply the original number by
100
to move the decimal point to the right two places. - Cast the result to an integer to remove the remaining decimal places.
- Divide the result by
100.0
to move the decimal point back to the left two places.
Here’s the full code:
public class Main {
public static void main(String args[]) {
double x = 100.899456;
double y = (int) (x * 100) / 100.0;
System.out.println("before: " + x);
System.out.println("after: " + y);
}
}
And here’s the output:
before: 100.899456
after: 100.89
Thanks for reading! 😀
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