2-58 TSP Programming Fundamentals Series 2600 System SourceMeters Reference Manual
2600S-901-01 Rev. A / May 2006 Return to Section 2 topics
4
5
Both and and or use short-cut evaluation, that is, they evaluate their second
operand only when necessary. A useful TSL construct is
x = x or v, which is
equivalent to:
if not x then x = v end
For example, it sets x to a default value v when x is not set (provided that x is not
set to
false).
To select the maximum of two numbers x and y, use the following statement (note
the
and operator has a higher precedence than or):
max = (x > y) and x or y
When x > y is true, the first expression of the and is true, so the and results in its
second argument
x (which is also true, because it is a number), and then the or
expression, results in the value of its first expression,
x. When x > y is false, the
and expression is false and so are the or results in its second expression, y.
The operator not always returns true or false:
print(not nil)
print(not false)
print(not 0)
print(not not nil)
Output of code above:
true
true
false
false
Concatenation
TSL denotes the string concatenation operator by “..” (two dots). If any of its
operands is a number, TSL converts that number to a string:
print("Hello ".."World")
print(0 .. 1)
Output of code above:
Hello World
01
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