C/C++ Compiler (cl.hlp) (Table of Contents; Topic list)
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C2379
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     Compiler error C2379
 
     formal parameter 'number' has different type when promoted
 
     The type of the specified parameter is not compatible through
     default promotions with the type found in a previous declaration.
 
     For functions are compatible only if the types of each parameter
     are compatible after the application of default argument
     promotions.
 
     This is an error in ANSI C (/Za) and a warning when the Microsoft
     extension (/Ze) is used.
 
     The following example causes this error:
 
          void func();
          void func(char);     // error, char promotes to int
                                    -♦-