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1. Using DEF, you can define your own commands like the below
   About DEF User-Defined Commands
2. A keyword used to define a user-defined command/function beyond the program slot
   About COMMON

1. Using DEF, you can define your own commands like the below

About DEF User-Defined Commands

1) USER (no argument, no return value)
2) USER X,Y (with arguments, no return value)
3) A=USER(X) (with arguments, 1 return value)
4) USER X OUT A,B (with arguments, multiple return values)

DEF Common Rules

・The definition range is from DEF to END.
・Defined variables and labels in the DEF to END range cannot be used from outside the DEF (local variables).
・GOTO and GOSUB across the DEF to END range are not possible.
・By adding COMMON, you can define commands that can be used from outside the defined program slot.

2. A keyword used to define a user-defined command/function beyond the program slot

About COMMON

・When using a program between different program slots, execute it with EXEC first.

1) COMMON DEF USER
2) COMMON DEF USER(X)
3) COMMON DEF USER X OUT A,B

Example

COMMON DEF FOO(X,Y,Z)

Example

A$="12345" 
A$[3] → "4" 
A$[3]="ABC" → "123ABC5"