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2600S-901-01 Rev. C / January 2008 Return to Section Topics 2-49

Series 2600 System SourceMeter® Instruments Reference Manual Section 2: TSP Programming

print(nil and 13)

print(false and 13)

print(4 or 5)

print(false or 5)

Output of code above:

nil

false

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,

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

false

Concatenation

TSL denotes the string concatenation operator by “..” (two dots). If any of its operands is a number,

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