Topic       : The GFA-Basic Compendium
Author      : GFA Systemtechnik GmbH
Version     : GFABasic.HYP v2.98 (12/31/2023)
Subject     : Documentation/Programming
Nodes       : 899
Index Size  : 28056
HCP-Version : 3
Compiled on : Atari
@charset    : atarist
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@width      : 75
@hostname   : STRNGSRV
@hostname   : CAB     
@hostname   : HIGHWIRE
@hostname   : THING   
View Ref-FileMID$(a$,x[,y])=b$ (as a command)

a$: svar
b$: sexp
x, y: iexp

MID$() used as an instruction makes possible the replacement of part of a
string variable a$ with the string expression b$. So with MID$(a$,x,y)=b$,
characters from b$ will overwrite those in a$, starting at the x-th character
position of a$. The optional parameter y determines how many characters of b$
are used. If y is omitted, then as many characters as possible of a$ are
replaced with those from b$. The length of a$ is unchanged, so that no
characters will be written beyond the end of a$.

Example:

    a$="GFA SYSTEMTECHNIK"
    MID$(a$,5)="BASIC "
    '
    b$="Testword"
    MID$(b$,6,10)="are you serious?"
    PRINT a$, b$

--> 'GFA BASIC TECHNIK' and 'Testware' are printed.