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     Compiler warning (level 4) C4032
 
     formal parameter 'number' has different type when promoted
 
     The type of the specified parameter is not compatible through
     default promotions with the type in a previous declaration.
 
     For two function types to be compatible the type of each parameter
     must be compatible with the type that results from application of
     the default argument promotion.
 
     This is an error in ANSI C (/Za) and a warning when the Microsoft
     extensions (/Ze) are used.
 
     The following example causes this warning:
 
          void func();
          void func(char);     // warning, char promotes to int
                                    -♦-