INFO: Formal Parameters Default to Type int

• The Microsoft C/C++ Compiler (CL.EXE) included with: - Microsoft C for MS-DOS, versions 6.0, 6.0a, 6.0ax - Microsoft C for OS/2, versions 6.0, 6.0a - Microsoft C/C++ for MS-DOS, version 7.0 - Microsoft Visual C++ for Windows, versions 1.0, 1.5 - Microsoft Visual C++, 32-bit Edition, versions 1.0, 2.0, 4.0, 5.0

SUMMARY

In Microsoft C, a function declaration such as the following does not generate a compiler error even though the variable "voida" is not referenced:

   void main (voida)
   {
   }

MORE INFORMATION

The C and QuickC compilers do not generate an error because the variable "voida" defaults to a variable of type int. The compilers understand the above function definition because they recognize the "old style" of ANSI C declarations as well as the new. In general, the equivalents of the above code are as follows:

   Old Style                           New Style
   ---------                           ---------

   void function (voida)               void function (int voida)
   int voida; <- default if missing    {
   {                                   }
   }