A number of changes have been made to the compiler to support the ANSI standard. By default, the Microsoft-extensions to the compiler are enabled (/Ze). When you compile with /Za (disable Microsoft extensions), the compiler generates errors and warnings for code that does not conform to the ANSI standard.
Note:
There are no areas of nonconformance to the ANSI standard in Microsoft C version 7.0, when compiling with the /Za command-line option.
The changes and deletions listed in this section may affect existing programs.