Function prototype: Difference between revisions
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With this structure the "function" is declared at the program, the implementation is somewhere down in the middle, and the mainline (<code>test</code> here) is at the end. |
With this structure the "function" is declared at the program, the implementation is somewhere down in the middle, and the mainline (<code>test</code> here) is at the end. |
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The <code>define()</code> BIF is used for more than merely providing function-like access to a label with the same name. It is used to prototype all of these (with some default behaviour): |
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* the function name (<code>multiply</code> in the examples); |
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* the formal arguments to the function (<code>a, b</code> in the examples); |
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* the entry point label for the function's code (defaults to the function name); |
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* any local variables which should be protected in the function (defaults to none). |
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Thus a highly-contrived example function that illustrates all of these would look like this: |
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<lang snobol4> define('multiply(a,b)acc1,acc2','mult_impl') :(mult_end) |
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mult_impl acc1 = a |
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acc2 = b |
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multiply = acc1 * acc2 :(return) |
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mult_end |
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* Test |
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output = multiply(10.1,12.2) |
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output = multiply(10,12) |
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end</lang> |
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=={{header|zkl}}== |
=={{header|zkl}}== |
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