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I'm a little freaked out by the results I'm getting when I do modulo arithmetic in Objective-C. -1 % 3 is coming out to be -1, which isn't the right answer: according to my understanding, it should be 2. -2 % 3 is coming out to -2, which also isn't right: it should be 1.
Is there another method I should be using besides the % operator to get the correct result?
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The modulus operator is added in the arithmetic operators in C, and it works between two available operands. It divides the given numerator by the denominator to find a result. In simpler words, it produces a remainder for the integer division. Thus, the remainder is also always an integer number only.
Exceptional Restrictions of the Modulus Operator in CThe % operator cannot be applied to a set of floating numbers (float or double). The compiler will produce a compile-time error if we try to use this operator with any floating-point variables or even constants in C.
Mod is a shortened term for modulus. Mod divides operand1 by operand2 (rounding floating-point numbers to integers) and returns only the remainder as result.
Objective-C is a superset of C99 and C99 defines a % b to be negative when a is negative. See also the Wikipedia entry on the Modulo operation and this StackOverflow question.
Something like (a >= 0) ? (a % b) : ((a % b) + b) (which hasn't been tested and probably has unnecessary parentheses) should give you the result you want.
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