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# C# | Math.Log10() Method

In C#, Math.Log10() is a Math class method. It is used to return the base 10 logarithm of a specified number.

Syntax:

`public static double Log10(double val)`

Parameter:

val: It is the specified number whose logarithm to be calculated and its type is System.Double.

Return Value: It returns the logarithm of val(base 10 log of val) and its type is System.Double.

Note: Parameter val is always specified as a base 10 number. The return value is depend on the argument passed. Below are some cases:

• If the argument is positive then method will return the natural logarithm or log10(val).
• If the argument is zero, then the result is NegativeInfinity.
• If the argument is Negative(less than zero) or equal to NaN, then the result is NaN.
• If the argument is PositiveInfinity, then the result is PositiveInfinity.
• If the argument is NegativeInfinity, then the result is NaN.

Example:

 `// C# program to demonstrate working``// of Math.Log10(Double) method``using` `System;`` ` `class` `Geeks {`` ` `    ``// Main Method``    ``public` `static` `void` `Main(String[] args)``    ``{`` ` `        ``// double values whose logarithm ``        ``// to be calculated``        ``double` `a = 4.55;``        ``double` `b = 0;``        ``double` `c = -2.45;``        ``double` `nan = Double.NaN;``        ``double` `positiveInfinity = Double.PositiveInfinity;     ``        ``double` `negativeInfinity = Double.NegativeInfinity;`` ` `        ``// Input is positive number so output``        ``// will be logarithm of number``        ``Console.WriteLine(Math.Log10(a));`` ` `        ``// positive zero as argument, so output ``        ``// will be -Infinity``        ``Console.WriteLine(Math.Log10(b));`` ` `        ``// Input is negative number so output``        ``// will be NaN``        ``Console.WriteLine(Math.Log10(c));`` ` `        ``// Input is NaN so output``        ``// will be NaN``        ``Console.WriteLine(Math.Log10(nan));`` ` `        ``// Input is PositiveInfinity so output``        ``// will be Infinity``        ``Console.WriteLine(Math.Log10(positiveInfinity));`` ` `        ``// Input is NegativeInfinity so output``        ``// will be NaN``        ``Console.WriteLine(Math.Log10(negativeInfinity));``    ``}``}`

Output:

```0.658011396657112
-Infinity
NaN
NaN
Infinity
NaN
```

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