Predefined data types

C# defines the following data types:

1. sbyte
2. short
3. int
4. long
5. byte
6. ushort
7. uint
8. ulong
9. float
10. double
11. decimal
12. bool
13. char
14. string

sbyte, short, int and long are singed integer type.

byte, ushort, unit and ulong are unsigned integer types

Predefined C# types have alias in System namespace.

For example, the alias for int type is System.Int32

using System;

class Program
{
    static void Main(string[] args)
    {
        int i = 5;
        System.Int32 j = 10;

        Console.WriteLine(i);
        Console.WriteLine(j);
    }
}

The output:

5
10