Data Types in C#
Introduction
There are many data types in the C# programming language. The bolded ones in the tables and sections below are the ones that will be used in this course.
Integral Numeric Types
| C# Type | Range | Size | .NET type |
|---|---|---|---|
| sbyte | -128 to 127 | Signed 8-bit integer | System.SByte |
| byte | 0 to 255 | Unsigned 8-bit integer | System.Byte |
| short | -32,768 to 32,767 | Signed 16-bit integer | System.Int16 |
| ushort | 0 to 65,535 | Unsigned 16-bit integer | System.UInt16 |
| int | -2,147,483,648 to 2,147,483,647 | Signed 32-bit integer | System.Int32 |
| uint | 0 to 4,294,967,295 | Unsigned 32-bit integer | System.UInt32 |
| long | -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807 |
Signed 64-bit integer | System.Int64 |
| ulong | 0 to 18,446,744,073,709,551,615 | Unsigned 64-bit integer | System.UInt64 |
Floating-point Numeric Types
| C# Type | Range | Precision | Size | .NET type |
|---|---|---|---|---|
| float | ±1.5 x 10−45, to ±3.4 x 1038 | ~6-9 digits | 4 bytes | System.Single |
| double | ±5.0 × 10-324 to ±1.7 × 10308 | ~15-17 digits | 8 bytes | System.Double |
| decimal | ±1.0 x 10-28 to ±7.9228 x 1028 | 28-29 digits | 16 bytes | System.Decimal |
Boolean
bool = 1 byte: True (1) or False (0)
The String Type
The string type represents a sequence of zero or more Unicode characters. string is an alias for System.String in .NET. The maximum size of a String object in memory is 2 GB, or about 1 billion characters.