# Category : Modula II Source Code

Archive : M2TUTOR.ZIP

Filename : REALMATH.MOD

MODULE RealMath;

FROM InOut IMPORT WriteString, WriteLn;

FROM RealInOut IMPORT WriteReal;

VAR Sum, Diff, Product, Div : REAL;

A, B : REAL;

Inumber : INTEGER;

Cnumber : CARDINAL;

BEGIN

A := 3.234; (* Assigns a value *)

B := A + 1.0123; (* Add a constant *)

Sum := A + B; (* Add two variables *)

Product := A * B; (* Multiplication *)

Div := A / B; (* Division *)

Diff := A - B; (* Subtraction *)

A := (A + B)/(12. * A - B); (* Multiple math expression *)

WriteString("The REAL values are");

WriteReal(Sum,12);

WriteString(" ");

WriteReal(Diff,12);

WriteString(" ");

WriteReal(Product,12);

WriteString(" ");

WriteReal(Div,12);

WriteLn;

(* Conversion between data types - illustration *)

Inumber := 15; (* This is an INTEGER *)

Cnumber := 333; (* This is a CARDINAL *)

A := FLOAT(Inumber); (* INTEGER to REAL *)

B := FLOAT(Cnumber); (* CARDINAL to REAL *)

Inumber := TRUNC(Sum); (* REAL to INTEGER *)

Cnumber := TRUNC(Sum); (* REAL to CARDINAL *)

A := MIN(REAL); (* This produces the smallest REAL *)

A := MAX(REAL); (* This produces the largest REAL *)

END RealMath.

(* Result of execution

The REAL values are 7.4803E+000 -1.0123E+000 1.3733E+001 7.6160E-001

*)

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