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I'm creating an RPN calculator for a school project and having trouble with the modulus operator. Since we're using the double data type, modulus won't work on floating-point numbers. For example, 0.5 % 0.3 should return 0.2, but I'm getting a division by zero exception.
The instruction says to use fmod(). I've looked everywhere for fmod(), including javadoc, but I can't find it. I'm starting to think it's a method I'm going to have to create?
Edit: Hmmm, strange. I just plugged in those numbers again and it seems to be working fine… but just in case. Do I need to watch out for using the mod operator in Java when using floating types? I know something like this can't be done in C++ (I think).
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Double Modulus OperatorIf either or both operands of the mod operator have type double, then evaluating it produces the remainder. This kind of mod operator does not exist in C or C++ where the mod operator only works with int operands.
The modulus is basically finding the remainder. For this, we can use the remainder() function in C. The remainder() function is used to compute the floating point remainder of numerator/denominator. So the remainder(x, y) will be like below.
Yes, %(modulo) operator isn't work with floats and double.. if you want to do the modulo operation on large number you can check long long int(64bits) might this help you.
As we learn in first paragraph, in Java modulus, operator can also be applied to floating-point numbers e.g. 3.0%1.0 is perfectly legal in Java. Since it return remainder value in division operation it is also known as remainder operator.
You probably had a typo when you first ran it.
evaluating 0.5 % 0.3 returns '0.2' (A double) as expected.
Mindprod has a good overview of how modulus works in Java.
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