• Algol 68 Genie documentation

Basic Tips

• Most whitespace is optional: FORiFROM1TO9DOprint(i)OD
• You can omit different parts of FOR:
  • FORiTO9DOprint(i)OD - loops from 1 to 9
  • TO9DOprint(i)OD - loops 9 times
  • FORiDOprint(i)OD - counts up from 1 forever
• Use (…|…|…) instead of IF … THEN … ELSE … FI or CASE … IN … OUT … ESAC
• MOD is %*, OVER is %, ** is ^

Numerics

You can set the precision of LONG LONG INT and LONG LONG REAL to arbitrary numbers of digits by using a pragma like PRprec=1000PR (1000 digits). This can appear absolutely anywhere in your code, so put it somewhere that doesn't require any whitespace around it.

Patterns

• C-Style format specifiers are useful: use printf(($%dl$,i)) instead of printf(($g(0)l$,i))
• Use q instead of " "
• Use n(...) to replicate something, e.g. printf($%n(j)q$) to print j spaces (page 155 of the manual)