LOOP ~ ENDLOOP

A LOOP block loops a section of code forever.

Syntax

LOOP
 statements...
ENDLOOP

Examples

Anything inside the LOOP will be looped forever, unless there is a way for the loop to exit (e.g. a BREAK statement.)

'this loop runs forever
LOOP
 PRINT "I'm running forever!"
ENDLOOP

'this loop will exit if the random number is 7
'or, each iteration has a 1/10 chance of exiting
LOOP
 PRINT "Will I escape?"
 IF RND(10)==7 THEN BREAK
ENDLOOP
PRINT "I made it!"

Most complex interactive programs have a "main loop" that contains the core logic. It's a common-sense design pattern to have a block of code that coordinates the rest of your program, and it only makes sense to have it loop as long as necessary. LOOP is the perfect candidate.

'a simple interactive program
LOOP
 VSYNC
 IF BUTTON(0,#B_A) THEN PRINT "A button"
 IF BUTTON(0,#B_B) THEN PRINT "B button"
 IF BUTTON(0,#B_Y) THEN CLS
 IF BUTTON(0,#B_X) THEN BREAK
ENDLOOP