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   ► KBTo/From GuidesDelphi PrismTool Basics  Print This     

String Concatenation (Cross Ref > Tool Basics)

By Mike Prestwood

Delphi Prism versus C++: A side by side comparison between Delphi Prism and C++.

 
Operators
 

A language symbol used for assignment, comparison, computational, or as a logical.

String Concatenation

[Other Languages] 
Delphi Prism:   +

Unlike Delphi, Prism performs implicit casting. To concatenate two strings, a string to an integer, or a string to a floating point number, use the + operator. For example, to convert a floating point number to a string just concatenate an empty string to the number as in "" + 3.2.

Alternatively, you can use the System.Text.StringBuilder class which frequently but not always provides faster code.

Syntax Example:
var FirstName : String;
var LastName : String;
  
FirstName := 'Mike';
LastName := 'Prestwood';
ShowMessage('Full name: ' + FirstName + ' ' + LastName);
  
//Implicit casting of numbers.
//
//This fails:
//MessageBox.Show(3.3);
//
//This works:
MessageBox.Show("" + 3.3);
C++:  "String Concatenation" + or append

The + operator can be used with any combination of C++ strings, C strings and characters.

Syntax Example:
string fullname;

fullname = "Mike ";
fullname.append("Prestwood");

cout << "Hello " + fullname + "." << endl;












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