Question

what do you mean by default mode of screen in Qbasic why only screen 0 is called Qbasic ​

Answer 1

Answer:

The SCREEN mode INTEGER values available are 0 to 2 and 7 to 13, as listed below.

QB64 can use a LONG _NEWIMAGE page or _LOADIMAGE file image handle value instead.

The empty comma disables color when any value is used. Include the comma only when using page flipping.

If the SCREEN mode supports pages, the active page is the page to be worked on while visual page is the one displayed.

Usage:

No SCREEN statement in a program defaults to SCREEN 0 text ONLY mode.

A SCREEN statement that changes screen modes also clears the screen like CLS. Nothing on the screen is retained.

Some screen mode text sizes are adjustable with WIDTH and all QB54 screens support PCOPY and page flipping.