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Reserved keywords

The following words are reserved and cannot be used as identifiers:

and by case do else end export extern for function global if import in include inline loop nil not object of on or otherwise repeat return task tell then to until when while

Comments

To write comments, use the character #. Any text from this character to the end of the line is ignored. Each line to be commented must be preceded by the # character, i.e. C-like multi-line comments are not allowed.

Macro comments
# Now plot the field
plot (Z500) # using default contours 

Functions

The following examples show how to write functions in Macro. A function does not need to have a return value.

# function that takes no arguments
function always_return_5 ()
    return 5
end always_return_5

five = always_return_5()


# function that takes an argument and does no type-checking
function add_10_untyped (a)
    return a+10
end add_10_untyped

b = add_10_untyped(4)


# function that takes two arguments
function add_two_untyped (a, b)
    return a+b
end add_two_untyped

b = add_two_untyped(9, 11)


# function that takes an argument that must be a number
function add_10_to_number (a:number)
    return a+10
end add_10_to_number

b = add_10_to_number(6)
b = add_10_to_number('Hello')  # Run-time error


# function that takes any number of arguments
function print_all_params
    loop arg in arguments()
        print(arg)
    end loop
end print_all_params

print_all_params(5, 6, 7, 'Hello')


Loops, tests & functions

Please check this handout: macrotut_syntax.pdf

Macro tutorial

To learn more about the Macro syntax, please follow the Metview Tutorials.

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