ID Number: Q59439
5.00 5.10 6.00 6.00a 6.00ax | 5.00 5.10 6.00 6.00a
MS-DOS | OS/2
Summary:
Function prototypes must have parameter lists. If no arguments are to
be passed to a function, the parameter list must contain the keyword
"void". At warning level three (/W3), leaving the "void" out of such a
prototype parameter list leads to the following warning message in C
versions 5.0 and 6.0 and QuickC Versions 2.0, 2.01, 2.5, and 2.51:
C4071 'name' : no function prototype given
In C Version 5.1, the following additional warning message occurs:
C4103 Function definition used as prototype
Microsoft C/C++ version 7.0 does not issue the above warning.
More Information:
The following code demonstrates the problem:
Sample Code
-----------
/* Compile option needed: none
myfunc is not prototyped correctly
*/
#include <stdio.h>
void myfunc(); /* missing void in parameter list */
void main(void)
{
myfunc(); /* myfunc still not prototyped */
}
void myfunc() /* function definition doesn't need void */
{
printf("Hello\n");
}