remquo, remquof, remquol

Computes the remainder of two integer values, and stores an integer value with the sign and approximate magnitude of the quotient in a parameter.


double remquo( double numer, double denom, int* quo );
float remquof( float numer, float denom, int* quo );
long double remquol( long double numer, long double denom, int* quo );
#define remquo(X, Y, INT_PTR) // Requires C11 or higher

float remquo( float numer, float denom, int* quo ); /* C++ only */
long double remquo( long double numer, long double denom, int* quo ); /* C++ only */


The numerator.

The denominator.

A pointer to an integer to store a value that has the sign and approximate magnitude of the quotient.

Return value

remquo returns the floating-point remainder of x / y. If the value of y is 0.0, remquo returns a quiet NaN. For information about the representation of a quiet NaN by the printf family, see printf, _printf_l, wprintf, _wprintf_l.


The remquo function calculates the floating-point remainder f of x / y such that x = n * y + f*, where n is an integer, f has the same sign as x, and the absolute value of f is less than the absolute value of y.

C++ allows overloading, so you can call overloads of remquo that take and return float or long double values. In a C program, unless you're using the <tgmath.h> macro to call this function, remquo always takes two double arguments and returns a double.

If you use the <tgmath.h> remquo() macro, the type of the argument determines which version of the function is selected. See Type-generic math for details.

By default, this function's global state is scoped to the application. To change this behavior, see Global state in the CRT.


Function Required header (C) Required header (C++)
remquo, remquof, remquol <math.h> <cmath> or <math.h>
remquo macro <tgmath.h>

For compatibility information, see Compatibility.


// crt_remquo.c
// This program displays a floating-point remainder.

#include <math.h>
#include <stdio.h>

int main( void )
   double w = -10.0, x = 3.0, z;
   int quo = 0;

   z = remquo(w, x, &quo);
   printf("The remainder of %.2f / %.2f is %f\n", w, x, z);
   printf("Approximate signed quotient is %d\n", quo);
The remainder of -10.00 / 3.00 is -1.000000
Approximate signed quotient is -3

See also

Math and floating-point support
ldiv, lldiv
fmod, fmodf
remainder, remainderf, remainderl