https://wiki.oberon.org/ob/o7/example/inttostring

	PROCEDURE RealToString (x: REAL; VAR s: ARRAY OF CHAR);
		VAR i, j, p: INTEGER; a: ARRAY 32 OF CHAR;
	BEGIN
		IntToString(FLOOR(x), s);
		i := 0;
		WHILE s[i] # 0X DO INC(i) END;
		s[i] := "."; INC(i);
		p := FLOOR(x*100.0) MOD 100;
		IF p = 0 THEN
			s[i] := "0"; INC(i);
			s[i] := "0"; INC(i)
		ELSE
			IntToString(p, a);
			j := 0; WHILE a[j] # 0X DO INC(j); END;
			IF j = 1 THEN
				s[i] := "0"; INC(i)
			END;
			j := 0;
			WHILE a[j] # 0X DO s[i] := a[j]; INC(j); INC(i) END;
		END;
		s[i] := 0X;
	END RealToString;