# 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:

## 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.

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.

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.

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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