# Math Class in C#

The Match class has static methods and constants for trigonometric, logarithmic and other mathematical functions.

The Math class in C# has Math.E and Math.PI fields. Let us see an example of both the fields −

## Math.E

It is the natural logarithmic base specified by the constant e.

### Syntax

The syntax is as follows −

public const double E = 2.71828182845905;

### Example

Let us now see an example −

using System;
public class Demo{
public static void Main(){
double d = Math.E;
Console.WriteLine("Math.E = " + d);
}
}

### Output

This will produce the following output −

Math.E = 2.71828182845905

## Math.PI

The Math.PI field represents the ratio of the circumference of a circle to its diameter, specified by the constant, π.

### Syntax

The syntax is as follows −

public const double PI = 3.14159265358979;

### Example

Let us now see an example −

using System;
public class Demo{
public static void Main(){
double d = Math.PI;
Console.WriteLine("Math.PI = " + d);
}
}

### Output

This will produce the following output −

Math.PI = 3.14159265358979

Now, let us see some examples of Math class methods.

## Math.Acos()

The Math.Acos() method in C# returns the angle whose cosine is the specified number. This number is a double value argument.

### Syntax

The syntax is as follows −

public static double Acos (double val);

Above, Val is the number representing a cosine, where Val must be greater than or equal to -1, but less than or equal to 1.

### Example

Let us now see an example to implement Math.Acos() method −

using System;
public class Demo {
public static void Main(){
double val1 = -0.0;
double val2 = Double.PositiveInfinity;
double val3 = Double.NaN;
Console.WriteLine("Return value of {0} : {1}",
val1, Math.Acos(val1));
Console.WriteLine("Return value of {0} : {1}",
val2, Math.Acos(val2));
Console.WriteLine("Return value of {0} : {1}",
val2, Math.Acos(val3));
}
}

### Output

This will produce the following output −

Return value of 0 : 1.5707963267949
Return value of ∞ : NaN
Return value of ∞ : NaN

## Math.Pow()

The Math.Pow() method in C# is used to compute a number raised to the power of some other number.

### Syntax

Following is the syntax −

public static double Pow(double val1, double val2)

Above, val1 is a double-precision floating-point number to be raised to a power., whereas val2 is a double-precision floating-point number that specifies a power.

### Example

Let us now see an example to implement Math.Pow() method −

using System;
public class Demo {
public static void Main(){
double res;
res = Math.Pow(5, 0);
Console.WriteLine("Math.Pow(5,0) = "+res);
res = Math.Pow(0,5);
Console.WriteLine("Math.Pow(0,5) = "+res);
}
}

### Output

This will produce the following output −

Math.Pow(5,0) = 1
Math.Pow(0,5) = 0