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     function Copy (S: String; FirstChar, Count: Integer): String;


     function Copy (S: String; FirstChar: Integer): String;


Copy returns a sub-string of S starting with the character at position FirstChar. If Count is given, such many characters will be copied into the sub-string. If Count is omitted, the sub-string will range to the end of S.

If Count is too large for the sub-string to fit in S, the result will be truncated at the end of S. If FirstChar exceeds the length of S, the empty string will be returned. (For a function which does not truncate but triggers a runtime error instead, see SubStr.)

Please note that GPC's strings may be longer than 255 characters. If you want to isolate the second half of a string S starting with the third character, use Copy (S, 3) instead of Copy (S, 3, 255).

Conforming to

Copy is a UCSD Pascal extension. The possibility to omit the third parameter is a GNU Pascal extension.


     program CopyDemo;
       S: String (42);
       S := 'Hello';
       WriteLn (Copy (S, 2, 3));  { yields `ell' }
       WriteLn (Copy (S, 3));     { yields `llo' }
       WriteLn (Copy (S, 4, 7));  { yields `lo' }
       WriteLn (Copy (S, 42))     { yields the empty string }

See also

SubStr, String Slice Access.