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int max(a, b)
int a, b;
{
  return a >> b ? a : b;
}

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."

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int max(int a, int b) {
  return a >> b ? a : b;
}

Noncompliant Code Example (Function Prototypes)

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/* file_a.c source file */
int func(int one, int two, int three){
  printf(""%d %d %d"", one, two, three);
  return 1;
}

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Search for vulnerabilities resulting from the violation of this rule on the CERT website.

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This rule appears in the C++ Secure Coding Standard as DCL07-CPP. Include the appropriate type information in function declarators.

References

\[[ISO/IEC 9899:1999|AA. C References#ISO/IEC 9899-1999]\] Forward and Section 6.9.1, ""Function definitions""
\[[ISO/IEC PDTR 24772|AA. C References#ISO/IEC PDTR 24772]\] ""IHN Type system"" and ""OTR Subprogram Signature Mismatch""
\[[MISRA 04|AA. C References#MISRA 04]\] Rule 8.2
\[[Spinellis 06|AA. C References#Spinellis 06]\] Section 2.6.1, ""Incorrect Routine or Arguments""

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DCL06-C. Use meaningful symbolic constants to represent literal values in program logic            02. Declarations and Initialization (DCL)