remquo
From cppreference.com
                    
                                        
                    
                    
                                                            
                    | Defined in header <math.h>
  | ||
| float       remquof( float x, float y, int *quo ); | (since C99) | |
| double      remquo( double x, double y, int *quo ); | (since C99) | |
| long double remquol( long double x, long double y, int *quo ); | (since C99) | |
Computes the remainder of the floating point division operation x/y as the remainder() function does. Additionally, the sign and at least the three of the last bits of x/y will be stored in quo.
[edit] Parameters
| x, y | - | floating point values | 
| quo | - | pointer to an integer value to store some bits of x/y in | 
[edit] Return value
Remainder of dividing arguments
[edit] See also
| (C99) | signed remainder of the division operation (function) | 
| remainder of the floating point division operation (function) | |
| (C99) | the quotient and remainder of integer division (function) |