# C# | Math.Floor() Method

Last Updated : 31 Jan, 2019

In C#, Math.Floor() is a Math class method. This method is used to find the largest integer, which is less than or equal to the passed argument. The floor method operates both functionalities in decimal and double. This method can be overload by passing different arguments to it.

• Math.Floor(Decimal) Method
• Math.Floor(Double) Method

#### Math.Floor(Decimal) Method

This method is used to returns the largest integer less than or equal to the specified decimal number in the argument list.

Syntax:

```public static decimal Floor(decimal d)
```

Parameter:

Decimal d: It is the decimal number of type System.Decimal.

Return Type: This function return the largest integer which will be less than or equal to d. The type of this method is System.Decimal.

Examples:

```Input  : 12.9
Output : 12

Input  : -12.9
Output : -13
```

Program : To demonstrate the Math.Floor(Decimal) method.

 `// C# program to illustrate the ` `// Math.Floor(Decimal) function ` `using` `System; ` ` `  `public` `class` `GFG { ` ` `  `    ``// Main method ` `    ``static` `public` `void` `Main() ` `    ``{ ` ` `  `        ``// Different numbers list to find ` `        ``// its floor values ` `        ``Console.WriteLine(Math.Floor(0.2018)); ` `        ``Console.WriteLine(Math.Floor(123.123)); ` `        ``Console.WriteLine(Math.Floor(-0.2)); ` `        ``Console.WriteLine(Math.Floor(0.0)); ` `        ``Console.WriteLine(Math.Floor(34.67M)); ` `    ``} ` `} `

Output:

```0
123
-1
0
34
```

#### Math.Floor(Double) Method

This method is used to returns the largest integer less than or equal to the specified double-precision floating-point number in the argument list.

Syntax:

```public static double Floor(double d)
```

Parameter:

Double d: It is the double number of type System.Double.

Return Type: This method returns the largest integer less than or equal to d. If d is equal to NaN, NegativeInfinity, or PositiveInfinity, that value is returned. The type of this method is System.Double.

Examples:

```Input  : 987654321.012
Output : 987654321

Input  : -99999
Output : -100000
```

Program : To demonstrate the Math.Floor(Double) method.

 `// C# program to illustrate the ` `// Math.Floor(Double) function ` `using` `System; ` `class` `GFG { ` ` `  `    ``// Main method  ` `    ``static` `void` `Main() ` `    ``{ ` ` `  `        ``// Two values. ` `        ``double` `n1 = 0.2018; ` `        ``double` `n2 = 123.123; ` `        ``double` `n3 = -2.2; ` `        ``double` `n4 = -123.123; ` ` `  `        ``// Take floors of these values. ` `        ``double` `floor1 = Math.Floor(n1); ` `        ``double` `floor2 = Math.Floor(n2); ` `        ``double` `floor3 = Math.Floor(n3); ` `        ``double` `floor4 = Math.Floor(n4); ` ` `  `        ``// Print First values and floor ` ` `  `        ``Console.WriteLine(``"value n1 = "` `+ n1); ` `        ``Console.WriteLine(``"Floor1 values is = "` `+ floor1); ` ` `  `        ``// Print 2nd values and floor ` ` `  `        ``Console.WriteLine(``"value n2 = "` `+ n2); ` `        ``Console.WriteLine(``"Floor2 values is = "` `+ floor2); ` ` `  `        ``// Print 3rd values and floor ` ` `  `        ``Console.WriteLine(``"value n3 = "` `+ n3); ` `        ``Console.WriteLine(``"Floor3 values is = "` `+ floor3); ` ` `  `        ``// Print 4th values and floor ` ` `  `        ``Console.WriteLine(``"value n4 = "` `+ n4); ` `        ``Console.WriteLine(``"Floor4 values is = "` `+ floor4); ` `    ``} ` `} `

Output:

```value n1 = 0.2018
Floor1 values is = 0
value n2 = 123.123
Floor2 values is = 123
value n3 = -2.2
Floor3 values is = -3
value n4 = -123.123
Floor4 values is = -124
```