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Showing content from https://cplusplus.com/reference/cmath/fmod/ below:

function

fmod

double fmod (double numer, double denom);

     double fmod  (double numer     , double denom);      float fmodf (float numer      , float denom);long double fmodl (long double numer, long double denom);

     double fmod (double numer     , double denom);      float fmod (float numer      , float denom);long double fmod (long double numer, long double denom);

     double fmod (double numer     , double denom);      float fmod (float numer      , float denom);long double fmod (long double numer, long double denom);     double fmod (Type1 numer      , Type2 denom);       // additional overloads

Compute remainder of division

Returns the floating-point remainder of numer/denom (rounded towards zero):

fmod = numer - tquot * denom

Where tquot is the truncated (i.e., rounded towards zero) result of: numer/denom.

A similar function, remainder, returns the same but with the quotient rounded to the nearest integer (instead of truncated).

Header

<tgmath.h>

provides a type-generic macro version of this function.

Additional overloads

are provided in this header (

<cmath>

) for other combinations of

arithmetic types

(

Type1

and

Type2

): These overloads effectively cast its arguments to

double

before calculations, except if at least one of the arguments is of type

long double

(in which case both are casted to

long double

instead).

Parameters

numer: Value of the quotient numerator.
denom: Value of the quotient denominator.

Return Value The remainder of dividing the arguments.
If denom is zero, the function may either return zero or cause a domain error (depending on the library implementation).

If a

domain error

occurs, the global variable

errno

is set to

EDOM

Example

/* fmod example */
#include <stdio.h>      /* printf */
#include <math.h>       /* fmod */

int main ()
{
  printf ( "fmod of 5.3 / 2 is %f\n", fmod (5.3,2) );
  printf ( "fmod of 18.5 / 4.2 is %f\n", fmod (18.5,4.2) );
  return 0;
}

Output:

fmod of 5.3 / 2 is 1.300000
fmod of 18.5 / 4.2 is 1.700000