# C++ Math log2()

The function computes the base 2 logarithm of a given number.

## Parameter

x: The value whose logarithm is to be calculated.

## Return value

Parameter Return value
x>1 Positive
x=1 Zero
1>x> 0 Negative
x= 0 -infinity
x<0 Not a Number(nan)

## Example 1

Let's see the simple example when the value of x is greater than one.

Output:

```Value of x is : 2
log2(x) = 1
```

In this example, log2() function computes the logarithm value of base 2 when the value of x is greater than one

## Example 2

Let's see the simple example when the value of x is equal to 1.

Output:

```Value of x is : 1
log2(x) = 0
```

In this example, log2() function computes the logarithm value of base 2 when the value of x is equal to one.

## Example 3

Let's see the simple example when the value of x lies between 0 and 1.

Output:

```Value of x is : 0.2
log2(x) = -2.32193
```

In this example, log2() function computes the logarithm value of base 2 when the value of x is equal to 0.2.

## Example 4

Let's see the simple example when the value of x is equal to zero.

Output:

```Value of x is : 0
log2(x) = -inf
```

In this example, log2() function computes the logarithm value of base 2 when the value of x is equal to 0.

## Example 5

Let's see the simple example when the value of x is less than zero.

Output:

```Value of x is : -1.5
log2(x) = nan
```

In this example, log2() function computes the logarithm value of base 2 when the value of x is less than zero.

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