# float (C# Reference)

The `float`

keyword signifies a simple type that stores 32-bit floating-point values. The following table shows the precision and approximate range for the `float`

type.

Type | Approximate range | Precision | .NET type |
---|---|---|---|

`float` |
-3.4 × 10^{38} to +3.4 × 10^{38} |
7 digits | System.Single |

## Literals

By default, a real numeric literal on the right side of the assignment operator is treated as double. Therefore, to initialize a float variable, use the suffix `f`

or `F`

, as in the following example:

```
float x = 3.5F;
```

If you do not use the suffix in the previous declaration, you will get a compilation error because you are trying to store a double value into a `float`

variable.

## Conversions

You can mix numeric integral types and floating-point types in an expression. In this case, the integral types are converted to floating-point types. The evaluation of the expression is performed according to the following rules:

If one of the floating-point types is double, the expression evaluates to double or bool in relational or Boolean expressions.

If there is no double type in the expression, the expression evaluates to

`float`

or bool in relational or Boolean expressions.

A floating-point expression can contain the following sets of values:

Positive and negative zero

Positive and negative infinity

Not-a-Number value (NaN)

The finite set of nonzero values

For more information about these values, see IEEE Standard for Binary Floating-Point Arithmetic, available on the IEEE website.

## Example

In the following example, an int, a short, and a `float`

are included in a mathematical expression giving a `float`

result. (Remember that `float`

is an alias for the System.Single type.) Notice that there is no double in the expression.

```
class FloatTest
{
static void Main()
{
int x = 3;
float y = 4.5f;
short z = 5;
var result = x * y / z;
Console.WriteLine("The result is {0}", result);
Type type = result.GetType();
Console.WriteLine("result is of type {0}", type.ToString());
}
}
/* Output:
The result is 2.7
result is of type System.Single //'float' is alias for 'Single'
*/
```

## C# language specification

For more information, see the C# Language Specification. The language specification is the definitive source for C# syntax and usage.

## See also

Single

C# Reference

C# Programming Guide

Casting and Type Conversions

C# Keywords

Integral Types Table

Built-In Types Table

Implicit Numeric Conversions Table

Explicit Numeric Conversions Table