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{
FreePascal: https://www.freepascal.org/
Tested with FreePascal 2.4.0, 3.0.0
Usage:
$ fpc gcd.pas -ogcd-pas
$ ./gcd-pas 44 55 66 121
11
}
Program GCD(output);
Uses sysutils; {StrToInt}
Function gcd2(a: integer; b: integer): integer;
Var c: integer;
Begin
While b <> 0 Do
Begin
c := b;
b := a Mod b;
a := c;
End;
gcd2 := a;
End;
Function gcdn(n: Array Of integer): integer;
Var i: integer;
Begin
gcdn := n[0];
For i := 1 To High(n) Do {See also <http://wiki.freepascal.org/for-in_loop> }
gcdn := gcd2(gcdn, n[i]);
End;
Var
n: array Of integer;
i: integer;
Begin
SetLength(n, ParamCount);
For i := 1 To ParamCount Do
n[i-1] := StrToInt(ParamStr(i));
Writeln(gcdn(n))
End.
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