41 lines
1.3 KiB
Modula-2
41 lines
1.3 KiB
Modula-2
DEFINITION MODULE RealConversions;
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(*
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Module: string-to-real and real-to-string conversions
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Author: Ceriel J.H. Jacobs
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Version: $Id$
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*)
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PROCEDURE StringToReal(str: ARRAY OF CHAR; VAR r: REAL; VAR ok: BOOLEAN);
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(* Convert string "str" to a real number "r" according to the syntax:
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['+'|'-'] digit {digit} ['.' digit {digit}]
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['E' ['+'|'-'] digit {digit}]
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ok := "conversion succeeded"
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Leading blanks are skipped;
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Input terminates with a blank or any control character.
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*)
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PROCEDURE StringToLongReal(str: ARRAY OF CHAR;
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VAR r: LONGREAL;
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VAR ok: BOOLEAN);
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PROCEDURE RealToString(r: REAL;
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width, digits: INTEGER;
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VAR str: ARRAY OF CHAR;
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VAR ok: BOOLEAN);
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(* Convert real number "r" to string "str", either in fixed-point or
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exponent notation.
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"digits" is the number digits to the right of the decimal point,
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"width" is the maximum width of the notation.
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If digits < 0, exponent notation is used, otherwise fixed-point.
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If fewer than "width" characters are needed, leading blanks are inserted.
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If the representation does not fit in "width", then ok is set to FALSE.
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*)
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PROCEDURE LongRealToString(r: LONGREAL;
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width, digits: INTEGER;
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VAR str: ARRAY OF CHAR;
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VAR ok: BOOLEAN);
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END RealConversions.
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