remainder, remainderf, remainderl

Article
06/05/2017

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Computes the remainder of the quotient of two floating-point values, rounded to the nearest integral value.

Syntax

double remainder(   
   double numer,  
   double denom  
);  
float remainder(   
   float numer,  
   float denom  
); /* C++ only */  
long double remainder(   
   long double numer,  
   long double denom  
); /* C++ only */  
float remainderf(   
   float numer,  
   float denom  
);  
long double remainderl(   
   long double numer,  
   long double denom  
);

Parameters

numer
The numerator.

denom
The denominator.

Return Value

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

Remarks

The remainder function calculates the floating-point remainder r of x / y such that x = n * y + r, where n is the integer nearest in value to x / y and n is even whenever | n - x / y | = 1/2. When r = 0, r has the same sign as x.

Because C++ allows overloading, you can call overloads of remainder that take and return float or long double values. In a C program, remainder always takes two doubles and returns a double.

Requirements

Function	Required header
`remainder`, `remainderf`, `remainderl`	<math.h>

For compatibility information, see Compatibility.

Example

    // crt_remainder.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;  
    
    z = remainder(w, x);  
    printf("The remainder of %.2f / %.2f is %f\n", w, x, z);  
    }

    The remainder of -10.00 / 3.00 is -1.000000

.NET Framework Equivalent

System::Math::IEEERemainder

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