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Application Programming: Strings |
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The addition operator is used to concatenate strings. For example, the command:
A = 'This is' + ' a concatenation example.' PRINT, A
results in the following output:
This is a concatenation example.
Strings can also be broken across code lines:
Print, "This is a multi-line " $ + "string concatenation example."
results in the following output:
This is a multiline string concatenation example.
The following IDL statements build a scalar string containing a comma-separated list of the names found in the TREES string array:
; Create array of trees.
trees = ['Beech', 'Birch', 'Mahogany', 'Maple', 'Oak', $
'Pine', 'Walnut']
; Use REPLICATE to make an array with the correct number of commas
; and add it to trees.
names = trees + [REPLICATE(',', N_ELEMENTS(trees)-1), '']
; Show the resulting list.
PRINT, names
Running the above statements results in the following output:
Beech, Birch, Mahogany, Maple, Oak, Pine, Walnut
IDL Online Help (March 06, 2007)