C++ Math log10()
The function computes the common algorithm (base 10) of a given number.
Mathematically:
Suppose a number is ‘x’:
Syntax
Note: The return_type can be float, double or long double.
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).