C++ Math copysign() Function

C++ Math copysign() Function with tutorial for beginners and professionals with examples on isgreaterequal(), less(), islessequal(), islessgreater(), isunordered(), exp(), frexp(), ldexp(), log(), log10(), modf(), exp2(), expm1(), log1p(), log2(), logb(), scalbn(), scalbln() etc.

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C++ Math copysign()

The function returns the value with the magnitude of x and sign of y.

Syntax

Consider two numbers 'x' and 'y'. Syntax would be:

float copysign(float x, float y);
double copysign(double x, double y);
long double copysign(long double x, long double y);
promoted copysign(type1 x, type2 y);

Note: If any argument is of long double type, then the return type is promoted to long double. If not, the return type is promoted to double.

Parameter

x: Value with the magnitude.

y: Value with the sign.

Return value

It returns the value with the magnitude of x and sign of y.

Example 1

Let's see a simple example when the value of y is positive.

#include 
#include
using namespace std;
int main()
{
    double x=15.9;
    double y=9;
    std::cout << "Values of x and y are: " <Values of x and y are: 15.9, 9
copysign(15.9,9) =15.9

In this example, copysign() returns the magnitude of x i.e 15.9 with the sign of y which is negative.

Example 2

Let's see a simple example when the value of y is negative.

#include 
#include
using namespace std;
int main()
{
    double x=-8.6;
    double y=-3.2;
    std::cout << "Values of x and y are :" <Values of x and y are :-8.6 ,-3.2
copysign(-8.6,-3.2) =-8.6

In this example, copysign() returns the magnitude of x i.e 8.6 with the sign of y which is negative.

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