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Java: Calculations returning wrong answer?
Please explane why following program not giving correct output.
class Test
{
public static void main(String aa[])
{
float a=16.15 f;
float b =10.0f;
float c =a-b;
System.out.println(c);
}
}
/****************/ Out Put:-6.1499996
The problem lies with floats themselves, rather than your code, as per http://en.wikipedia.org/wiki/IEEE_floating-point_standard
For this case, consider either using doubles or BigDecimals
That's a perfectly normal consequence of floats not being able to store decimal values exactly.
Because floats, being base-2 cannot exactly represent 16.15 and therefore the result of the subtraction is not exactly -6.15.
The type float does not have good enough precision to return -6.15. double may not be enough either, floating point computations always have some margin of error.
