D.2.3- Concatenation operators

&

Name

Description

Syntax

Example

Note

Ampersand

Concatenates two expressions.

Returns the concatenated expressions:

Result = expression1 & expression2

If expression1 is "WROX " and expression2 is " Press" then the result is  "WROX Press".

The expressions are converted to a String subtype, if they
are not already of this subtype.

+

Name

Description

Syntax

Example

Note

+ Operator

Does the same as the & operator if both expressions are strings.

Returns the concatenated or summed expressions:

Result = expression1 + expression2

1 + "1" = 2

"1" + "1" = "11"

If one or both expressions are numeric, the + operator will work as an arithmetic + operator and sum the expressions.
A runtime error occurs if one expression is numeric and the other a string containing no numbers. It is recommended
that + should only be used for numeric addition and never for concatenation purposes (use & instead).