Primitive type

primitive-type-bytes

The range of byte is 0 to 255.

1 byte = 8 bits

The range of int is -2<sup>32</sup> to 2<sup>32</sup>. It's signed 32-bit integer.

primitive-type-dotnet

By default, the real number type is double. If we want to create a float number or a decimal number:

float a = 1.1f;
decimal b = 2.3m;

Variable vs Constant

int num;
const float Pi = 3.14f;

Type conversion

  1. Cast expression

    int i = 1;
byte b = (byte)i;

    It's very limited. It only works for conversing small data type to big one.

  2. Convert class

    string n = "123";
int i = Convert.ToInt32(n);