Function: Return the substring of S$ starting at Index for Len bytes.
Instruction: Assign S$ to the substring in strvar starting at Index for Len bytes.
Note: A similar function, Mid, returns the Len bytes starting at char Index.
Parameter
| Description (Mid Function)
| S$
| Copy chars from this string value. If this value is Null then Null is returned.
| Index
| Start copying chars starting at this index value. If the string is not that long then return a null string.
| Len
| Copy this many chars. If the S$ does not have that many chars starting at Index then copy the remainder of S$.
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Parameter
| Description (Mid Assignment)
| strvar
| Change part of this string.
| Index
| Change strvar starting at this index value. If the string is not that long then it is not changed.
| Len
| The number of chars copied is smallest of: the value of Len, the length of S$ and the remaining length of strvar. (If this value is omitted then the number of chars copied is the smallest of: the length of S$ and the remaining length of strvar.)
| S$
| Copy chars from this string value.
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