forked from KolibriOS/kolibrios
117 lines
2.0 KiB
Plaintext
117 lines
2.0 KiB
Plaintext
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(*
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adapted to Oberon-07 by 0CodErr, KolibriOS team
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*)
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(* Print first 'PRINT' digits of 'e'.
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*
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* Originally written in Pascal by Scott Hemphill
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* Rewritten in Modula-2 and modified by Andrew Cadach
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*
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*)
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MODULE exp;
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IMPORT In, Out, Console;
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CONST
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PRINT = 1024;
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DIGITS = PRINT + (PRINT + 31) DIV 32;
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TYPE
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number = ARRAY DIGITS + 1 OF INTEGER;
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VAR
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s, x: number;
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xs, i: INTEGER;
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PROCEDURE init (VAR x: number; n: INTEGER);
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VAR
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i: INTEGER;
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BEGIN
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x[0] := n;
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FOR i := 1 TO DIGITS DO x[i] := 0 END
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END init;
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PROCEDURE divide (VAR x: number; xs, n: INTEGER;
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VAR y: number; VAR ys: INTEGER);
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VAR
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i, c: INTEGER;
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BEGIN
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c := 0;
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FOR i := xs TO DIGITS DO
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c := 10 * c + x[i];
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y[i] := c DIV n;
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c := c MOD n
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END;
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ys := xs;
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WHILE (ys <= DIGITS) & (y[ys] = 0) DO INC(ys) END
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END divide;
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PROCEDURE add (VAR s, x: number; xs: INTEGER);
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VAR
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i, c: INTEGER;
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BEGIN
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c := 0;
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FOR i := DIGITS TO xs BY -1 DO
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c := c + s[i] + x[i];
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IF c >= 10 THEN
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s[i] := c - 10;
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c := 1
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ELSE
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s[i] := c;
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c := 0
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END
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END;
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i := xs;
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WHILE c # 0 DO
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DEC(i);
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c := c + s[i];
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IF c >= 10 THEN
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s[i] := c - 10;
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c := 1
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ELSE
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s[i] := c;
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c := 0
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END
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END
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END add;
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BEGIN
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Console.open;
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init(s, 0);
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init(x, 1);
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xs := 0;
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add(s, x, xs);
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i := 0;
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REPEAT
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INC(i);
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divide(x, xs, i, x, xs);
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add(s, x, xs);
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UNTIL xs > DIGITS;
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Out.Ln;
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Out.String (" e = ");
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Out.Char (CHR(s[0] + ORD("0")));
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Out.Char (".");
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FOR i := 1 TO PRINT DO
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Out.Char (CHR(s[i] + ORD("0")));
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IF i MOD 64 = 0 THEN
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Out.Ln;
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Out.Int (i, 5);
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Out.String (" ")
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END
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END;
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Out.Ln;
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Out.Ln;
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In.Ln;
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Console.exit(TRUE)
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END exp.
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