ugBASIC User Manual

   FOR var = start TO end [ STEP increment ]
      ...
   NEXT

This instruction implements a loop with explicit number of times to repeat. Each FOR statement must be matched by a single NEXT, and pairs of FOR…NEXT loops can be nested inside one another. Each loop repeats a list of instructions for a specific number of times, governed by an index which counts the number of times the loop is repeated. Once inside the loop, this index can be read by the program as if it is a normal variable.

Normally, the index counter is increased by 1 unit at every turn of a FOR…NEXT loop. When the current value exceeds that of the last number specified, the loop is terminated. STEP is used to change the size of increase in the index value.

  i = 0
  FOR i = 1 to 100 STEP 2
     PRINT i
  NEXT

See also the following example files:

• control_controlled_01.bas
• control_controlled_02.bas

 Fo...Nx

• 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

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!