C++ Math signbit() Function

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.

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);  

x: It is a floating point value.

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

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.

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.

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.