# C++ Math log10()

The function computes the common algorithm (base 10) of a given number.

## Mathematically:

Suppose a number is 'x':

## Parameter

x: The value whose common logarithm is to be calculated.

## Return value

Following are the return values of a given number:

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

## Example 1

Let's see a simple example when the value of x is greater than 1.

Output:

```Value of x is : 5
Log value of x is : 0.69897
```

In this example, the value of x is 5. Therefore, the function log10() returns the positive value i.e 0.69.

## Example 2

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

Output:

```Value of x is : 1
Log value of x is : 0
```

In this example, the value of x is 1. Therefore, the function log10() returns the value zero.

## Example 3

Let's see a simple example when the value of x is 0.3.

Output:

```Value of x is : 0.3
Log value of x is : -0.522879
```

In this example, the value of x is 0.3. Therefore, the function log10() returns the negative value i.e -0.52.

## Example 4

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

Output:

```Value of x is : 0
Log value of x is : -inf
```

In this example, the value of x is zero. Therefore, the function log10() returns negative infinity value.

## Example 5

Let's see a simple example when the value of x is -4

Output:

```Value of x is : -4
Log value of x is : nan
```

In this example, the value of x is -4. Therefore, the function log10() returns Not a Number(nan).

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