QA·C Help - 1047

	1047	[C] Function is being declared with default argument syntax after a previous call to the function. This is not allowed.

Constraint violations

This is an error. A function is being declared with default argument syntax when the function has already been called.

It is generally permitted in the C language (although not recommended) to call a function without previously declaring it; but this practice is not supported when the function is defined with default argument syntax. Message 1047 is generated when a function call precedes the function declaration and the declaration specifies default arguments.

Default arguments are a C++ specific feature, which is provided as an extension to ISO:C Standard by some compilers. QA·C will accept a constant expression or an object identifier as a default argument for a parameter, and use that argument whenever one is not provided explicitly in a function call.

For example:


/* PRQA S 1-9999 ++ */
/* PRQA S 1046,1047 -- */

extern int f1 (int, char);

int f2 (void)
{
  f1 (0, 1);
  f3 ();
}

extern int f1 (int a = 1, char b = 0);  /* Message 1046, 1047 */

extern int f3 (int a = 1);              /* Message 1046, 1047 */