One of my pet hates of C-derived languages (as a mathematician) is that
(-1) % 8 // comes out as -1, and not 7 fmodf(-1,8) // fails similarly What's the best solution?
C++ allows the possibility of templates and operator overloading, but both of these are murky waters for me. examples gratefully received.
First of all I'd like to note that you cannot even rely on the fact that (-1) % 8 == -1. the only thing you can rely on is that (x / y) * y + ( x % y) == x. However whether or not the remainder is negative is implementation-defined.
Now why use templates here? An overload for ints and longs would do.
int mod (int a, int b) { int ret = a % b; if(ret and now you can call it like mod(-1,8) and it will appear to be 7.
Edit: I found a bug in my code. It won't work if b is negative. So I think this is better:
int mod (int a, int b) { if(b Reference: C++03 paragraph 5.6 clause 4:
The binary / operator yields the quotient, and the binary % operator yields the remainder from the division of the first expression by the second. If the second operand of / or % is zero the behavior is undefined; otherwise (a/b)*b + a%b is equal to a. If both operands are nonnegative then the remainder is nonnegative; if not, the sign of the remainder is implementation-defined.
Here is a C function that handles positive OR negative integer OR fractional values for BOTH OPERANDS
#include float mod(float a, float N) {return a - N*floor(a/N);} //return in range [0, N) This is surely the most elegant solution from a mathematical standpoint. However, i'm not sure if it is robust in handling integers. Sometimes floating point errors creep in when converting int -> fp -> int.
I am using this code for non-int s, and a separate function for int.
NOTE: need to trap N = 0!
Tester code:
#include float mod(float a, float N) { float ret = a - N * floor (a / N); printf("%f.1 mod %f.1 = %f.1 \n", a, N, ret); return ret; } int main (char* argc, char** argv) { printf ("fmodf(-10.2, 2.0) = %f.1 == FAIL! \n\n", x); float x; x = mod(10.2f, 2.0f); x = mod(10.2f, -2.0f); x = mod(-10.2f, 2.0f); x = mod(-10.2f, -2.0f); return 0; } (Note: You can compile and run it straight out of CodePad: http://codepad.org/UOgEqAMA)
Output:
fmodf(-10.2, 2.0) = -0.20 == FAIL!
10.2 mod 2.0 = 0.2
10.2 mod -2.0 = -1.8
-10.2 mod 2.0 = 1.8
-10.2 mod -2.0 = -0.2
I have just noticed that Bjarne Stroustrup labels % as the remainder operator, not the modulo operator.
I would bet that this is its formal name in the ANSI C & C++ specifications, and that abuse of terminology has crept in. Does anyone know this for a fact?
But if this is the case then C's fmodf() function (and probably others) are very misleading. they should be labelled fremf(), etc
For integers this is simple. Just do
(((x where I am supposing that N is positive and representable in the type of x. Your favorite compiler should be able to optimize this out, such that it ends up in just one mod operation in assembler.
C++ operator overloading has little to do with it. You can't overload operators for built-in types. What you want is simply a function. Of course you can use C++ templating to implement that function for all relevant types with just 1 piece of code.
The standard C library provides fmod, if I recall the name correctly, for floating point types.
For integers you can define a C++ function template that always returns non-negative remainder (corresponding to Euclidian division) as ...
#include // abs template auto mod( Integer a, Integer b ) -> Integer { Integer const r = a%b; return (r ... and just write mod(a, b) instead of a%b.
Here the type Integer needs to be a signed integer type.
If you want the common math behavior where the sign of the remainder is the same as the sign of the divisor, then you can do e.g.
template auto floor_div( Integer const a, Integer const b ) -> Integer { bool const a_is_negative = (a auto floor_mod( Integer const a, Integer const b ) -> Integer { return a - b*floor_div( a, b ); } … with the same constraint on Integer, that it's a signed type.
The simplest general function to find the positive modulo would be this- It would work on both positive and negative values of x.
int modulo(int x,int N){ return (x % N + N) %N; } Oh, I hate % design for this too....
You may convert dividend to unsigned in a way like:
unsigned int offset = (-INT_MIN) - (-INT_MIN)%divider result = (offset + dividend) % divider where offset is closest to (-INT_MIN) multiple of module, so adding and subtracting it will not change modulo. Note that it have unsigned type and result will be integer. Unfortunately it cannot correctly convert values INT_MIN...(-offset-1) as they cause arifmetic overflow. But this method have advandage of only single additional arithmetic per operation (and no conditionals) when working with constant divider, so it is usable in DSP-like applications.
There's special case, where divider is 2N (integer power of two), for which modulo can be calculated using simple arithmetic and bitwise logic as
dividend&(divider-1) for example
x mod 2 = x & 1 x mod 4 = x & 3 x mod 8 = x & 7 x mod 16 = x & 15 More common and less tricky way is to get modulo using this function (works only with positive divider):
int mod(int x, int y) { int r = x%y; return rThis just correct result if it is negative.
Also you may trick:
(p%q + q)%q
It is very short but use two %-s which are commonly slow.
I believe another solution to this problem would be use to variables of type long instead of int.
I was just working on some code where the % operator was returning a negative value which caused some issues (for generating uniform random variables on [0,1] you don't really want negative numbers :) ), but after switching the variables to type long, everything was running smoothly and the results matched the ones I was getting when running the same code in python (important for me as I wanted to be able to generate the same "random" numbers across several platforms.
/* Warning: macro mod evaluates its arguments' side effects multiple times. */ #define mod(r,m) (((r) % (m)) + ((r)... or just get used to getting any representative for the equivalence class.
Here's a new answer to an old question, based on this Microsoft Research paper and references therein.
Note that from C11 and C++11 onwards, the semantics of div has become truncation towards zero (see [expr.mul]/4). Furthermore, for D divided by d, C++11 guarantees the following about the quotient qT and remainder rT
auto const qT = D / d; auto const rT = D % d; assert(D == d * qT + rT); assert(abs(rT) where signum maps to -1, 0, +1, depending on whether its argument is than 0 (see this Q&A for source code).
With truncated division, the sign of the remainder is equal to the sign of the dividend D, i.e. -1 % 8 == -1. C++11 also provides a std::div function that returns a struct with members quot and rem according to truncated division.
There are other definitions possible, e.g. so-called floored division can be defined in terms of the builtin truncated division
auto const I = signum(rT) == -signum(d) ? 1 : 0; auto const qF = qT - I; auto const rF = rT + I * d; assert(D == d * qF + rF); assert(abs(rF) With floored division, the sign of the remainder is equal to the sign of the divisor d. In languages such as Haskell and Oberon, there are builtin operators for floored division. In C++, you'd need to write a function using the above definitions.
Yet another way is Euclidean division, which can also be defined in terms of the builtin truncated division
auto const I = rT >= 0 ? 0 : (d > 0 ? 1 : -1); auto const qE = qT - I; auto const rE = rT + I * d; assert(D == d * qE + rE); assert(abs(rE) With Euclidean division, the sign of the remainder is always positive.
Example template for C++
template T mod( T a, T b ) { T const r = a%b; return ((r!=0)&&((r^b)With this template, the returned remainder will be zero or have the same sign as the divisor (denominator) (the equivalent of rounding towards negative infinity), instead of the C++ behavior of the remainder being zero or having the same sign as the dividend (numerator) (the equivalent of rounding towards zero).
define MOD(a, b) ((((a)%(b))+(b))%(b)) unsigned mod(int a, unsigned b) { return (a >= 0 ? a % b : b - (-a) % b); } This solution (for use when mod is positive) avoids taking negative divide or remainder operations all together:
int core_modulus(int val, int mod) { if(val>=0) return val % mod; else return val + mod * ((mod - val - 1)/mod); } I would do:
((-1)+8) % 8 This adds the latter number to the first before doing the modulo giving 7 as desired. This should work for any number down to -8. For -9 add 2*8.