The difference between int (3) and int (10)

Int (m) in the integer data type, m represents the maximum display width.
in int (m), the value of M is not related to how much storage space the Int (m) occupies. Int (3), int (4), and Int (8) All occupy 4 btyes of storage space on disk.
To put it bluntly, the Int (M) is the same as the int data type except that the way it is displayed to the user is a little different.

Int (10) shows the result as 0000000010
Int (3) shows the result as 010
It's a different length, it's a four-byte space.

The difference between int (3) and int (10)