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# Formatting numbers

## Formatting numbers

String formatting on numbers is very useful for creating readable output. This can be done through the use of the number object's **ToString()** method.

A common practice is printing out mathematical operations with the use of the **ToString()** method on the **double** object. What usually happens is the printing of a long string containing all the decimal places existing in the **double**. This sometimes makes output cluttered and hard to read. Luckily, C# has a robust set of string formatting options available to make the string more comprehendible.

Here is a list of common formatting options available in the **ToString()** method:

```csharp
double c = 10.25693;
Print("No formatting: " + c.ToString());
Print("Currency formatting: " + c.ToString("C"));
Print("Exponential formatting: " + c.ToString("E"));
Print("Fixed-point formatting: " + c.ToString("F2"));
Print("General formatting: " + c.ToString("G"));
Print("Percent formatting: " + c.ToString("P0"));
Print("Formatted to 2 decimal places: " + c.ToString("N2"));
Print("Formatted to 3 decimal places: " + c.ToString("N3"));
Print("Formatted to 4 decimal places: " + c.ToString("N4"));
```

The corresponding output is as follows:

* No formatting: 10.25693
* Currency formatting: \$10.26
* Exponential formatting: 1.025693E+001
* Fixed-point formatting: 10.26
* General formatting: 10.25693
* Percent formatting: 1,026 %
* Formatted to 2 decimal places: 10.26
* Formatted to 3 decimal places: 10.257
* Formatted to 4 decimal places: 10.2569

For custom formatting you can use the following:

```csharp
double phoneNumber = 9165551022;
Print("Phone number: " + phoneNumber.ToString("(###) ### - ####"));
```

Corresponding output:

* Phone number
* Phone number: (916) 555 - 1022

For more information on general string formatting the Microsoft documentation may be of use. Many other resources can be found online through a Google search as well.