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Section 10: Instrument programming Series 3700A System Switch/Multimeter Reference Manual

10-22 3700AS-901-01 Rev. D/June 2018

String concatenation

String operators

Operator

Description

Concatenates two strings. If either argument is a number, it is coerced to a string

(in a reasonable format) before concatenation.

Example: Concatenation

print(2 .. 3)

print("Hello " .. "World")

Output:

Hello World

Operator precedence

Operator precedence in Lua follows the order below (from higher to lower priority):

• ^ (exponentiation)

• not, - (unary)

• *, /

• +, –

• .. (concatenation)

• <, >, <=, >=, ~=, !=, ==

• and

• or

You can use parentheses to change the precedences in an expression. The concatenation ("..") and

exponentiation ("^") operators are right associative. All other binary operators are left associative. The

examples below show equivalent expressions.

Equivalent expressions

reading + offset < testValue/2+0.5

(reading + offset) <

((testValue/2)+0.5)

3+reading^2*4

3+((reading^2)*4)

Rdg < maxRdg and lastRdg <=

expectedRdg

(Rdg < maxRdg) and (lastRdg <=

expectedRdg)

-reading^2

-(reading^2)

reading^testAdjustment^2

reading^(testAdjustment^2)

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