Evaluate procedure

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Standard Units

Math Unit

Math Unit Procedures and Functions

Evaluate procedure

Targets: MS-DOS, OS/2, Win32

Math Unit

Evaluates the given expression.

Declaration:

procedure Evaluate(Expr: String;
                    var Result: Extended;
                    var ErrCode: Longint);

Remarks:
Use Evaluate to evaluate any valid expression given in Expr. The Result variable returns the evaluated expression. If it succeeds, the ErrCode variable is 0.

Examples:

uses
  Math, Strings;
const
  Expr = 'cos(0)*(5^2-3.1)';
var
  Result: Extended;
  ErrCode: Longint;
begin
  Evaluate(Expr, Result, ErrCode);
  if ErrCode = 0 then 
    Writeln(Expr, ' = ', Fls(Result))
  else   
    Writeln('Invalid expression');
end.

The example above will print 21.9.


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- 4.45.2.26 -