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Attempting to compile a program with a function declarator that does not include the appropriate type information typically generates a warning but does not prevent program compilation. These warnings should be resolved (see MSC00-C. Compile cleanly at high warning levels).
Noncompliant Code Example (
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NonPrototype-Format Declarators)
The noncompliant code example uses the identifier-list form for parameter declarations.
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Section 6.11 of the C99 standard, "Future language directions," states that "The use of function definitions with separate parameter identifier and declaration lists (not prototype-format parameter type and identifier declarators) is an obsolescent feature."
Compliant Solution (
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NonPrototype-
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Format Declarators)
In this compliant solution, int is the type specifier, max(int a, int b) is the function declarator, and the block within the curly braces is the function body.
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In this noncompliant code example, the definition of func() in file_a.c expects three parameters but is supplied only two.
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| Code Block | ||
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/* file_b.c source file */ int func(int, int, int); func(1, 2, 3); |
DCL14-C. Do not make assumptions about the order of global variable initialization across translation units, shows how to use header files to accomplish this same goal in a more maintainable fashion.
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