1, (1) Dim x As Integer' integer variable

Dim y As Long' long integer variable

Dim z as a single-precision floating-point variable.

Dim string as string character variable

(2) Static sum is used as an integer static variable.

(3) Public f As Integer' shapes global variables.

2. Value range of integer data: -32768 ~ +32767.

3. Take out the value of X, add 1 and assign it to X..

Can be rewritten as: y = x

x = y + 1

4. Random integer x = Int( 19 * Rnd -9)

Please refer to adoption! thank you