ugBASIC User Manual

   DO
     ... instructions ...
   LOOP

The DO…LOOP command is used for repeatedly executing a block of statements. It creates a loop, which is a sequence of statements that is executed repeatedly, forever (unless exits using the EXIT keyword). You can nest DO LOOPs within other loops, creating more complex control structures.

If you want to repeat the statements a set number of times, the FOR…NEXT statement is usually a better choice, while if you want to repeat for specific conditions, you should use the WHILE…WEND and REPEAT…UNTIL statements.

It can be used, i.e., to ask the user to enter a choice and repeat the menu until the exit option is selected. If you want to exit a loop, make sure the exit condition of the loop is changed within the loop itself, otherwise you may create an infinite loop. If possible, avoid performing complex calculations within the exit condition, as they will be repeated with each iteration of the loop.

  DO
    x = x + 1
  LOOP

See also the following example files:

• control_loops_01.bas
• control_loops_02.bas
• control_loops_03.bas
• control_loops_04.bas
• control_loops_05.bas

 DoLp

• Atari (400/800)
• Atari XL/XE
• Commodore 128 (MOS 8502)
• Commodore 128 (Zilog Z80)
• Commodore 64
• Commodore 64+REU
• TRS-80 Color Computer
• TRS-80 Color Computer 3
• ColecoVision
• Amstrad CPC 664
• Dragon 32
• Dragon 64
• Thomson MO5
• Thomson MO5
• Olivetti Prodest PC128
• Commodore PLUS/4
• SEGA SC-3000
• SEGA SG-1000
• VG-5000
• Commodore VIC-20
• ZX Spectrum 48

FOR...NEXT WHILE...WEND REPEAT...UNTIL

If you have encountered a problem using this command, if you think there is a bug or the explanation is unclear, please open an issue for this keyword on GitHub. Thank you!