Concatenating Strings

The addition operator concatenates strings. For example, the command:

A = 'This is ' + 'a concatenation example.'

PRINT, A

results in the output:

This is a concatenation example.

The following statements build a scalar string containing a list of the names found in the TREES string array separated by commas:

; The list of names.

NAMES = ''

FOR I = 0, 6 DO BEGIN

; Add comma before next name.

IF (I NE 0) THEN NAMES = NAMES + ', '

; Add the new name to the end of the list.

NAMES = NAMES + TREES(I)

ENDFOR

; Show the resulting list.

PRINT, NAMES

Running the above statements gives the result:

Beech, Birch, Mahogany, Maple, Oak, Pine, Walnut