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Ingy döt Net 2023-07-01 11:58:00 -04:00
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Task/Call-a-function/ZX-Spectrum-Basic/call-a-function.basic Normal file
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10 REM functions cannot be called in statement context
20 PRINT FN a(5): REM The function is used in first class context. Arguments are not named
30 PRINT FN b(): REM Here we call a function that has no arguments
40 REM subroutines cannot be passed parameters, however variables are global
50 LET n=1: REM This variable will be visible to the called subroutine
60 GO SUB 1000: REM subroutines are called by line number and do not have names
70 REM subroutines do not return a value, but we can see any variables it defined
80 REM subroutines cannot be used in first class context
90 REM builtin functions are used in first class context, and do not need the FN keyword prefix
100 PRINT SIN(50): REM here we pass a parameter to a builtin function
110 PRINT RND(): REM here we use a builtin function without parameters
120 RANDOMIZE: REM statements are not functions and cannot be used in first class context.