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C++ Math signbit() Function

C++ Math signbit() 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 signbit()

The function checks whether the sign of a given number is negative or not. If the sign of a number is negative, it returns 1 otherwise 0.

The signbit() function can also be applied to infinite, NAN and zero value.

Syntax

Suppose a number is 'x'.Syntax would be:

bool signbit(float x);
bool signbit(double x);
bool signbit(long double x);
bool signbit(integral x);

Parameter

x: It is a floating point value.

Return value

It returns 1, if the value of x is negative otherwise 0(false).

Example 1

Let's see the simple example when the value of x is 9.

#include 
#include
using namespace std;
int main()
{
   int x=9;
   cout<<"value of x is :"<

Output:

value of x is :9
signbit(x) : 0

In this example, signbit(x) function determines that the value of x is positive. Therefore, it returns 0.

Example 2

Let's see the simple example when the value of x is -2.

#include 
#include
using namespace std;
int main()
{
   int x= -2;
   cout<<"value of x is : "<

Output:

value of x is : -2
signbit(x) : 1

In this example, signbit(x) function determines that the value of x is negative. Therefore, it returns 1.

Example 3

Let's see the simple example when the value of x is infinite.

#include 
#include
using namespace std;
int main()
{
  float x=11.0/0.0;
  cout<<"value of x is : "<

Output:

value of x is : inf
signbit(x) : 0

In this example, signbit(x) function determines that the value of x is positive infinite. Therefore, it returns 0 value.


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