Expression/Declaration Syntax Errors

In my calc prog, I get errors. These errors:

Code:

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C:\Borland\BCC55\zack>bcc32 -I..\include  -L..\lib calc
Borland C++ 5.5.1 for Win32 Copyright (c) 1993, 2000 Borland
calc.cpp:
Error E2188 calc.cpp 13: Expression syntax
Error E2293 calc.cpp 55: ) expected
Error E2141 calc.cpp 55: Declaration syntax error
*** 3 errors in Compile ***

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for the attachment. Could anyone tell me what's wrong?

P.S.:I'd like if someone could tell me what the things in subtraction are. Like:the difference.
Thanks in advance

Code:

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double subtract(int 111, int 222){
                return 111-222;}
        double mult(int 333, int 444){
                return 333*444;}
        double div(int 555, int 666){
                return 555/666;}

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Variable names must begin with a character.

I've got it now. Thanks, Sang-drax! Everyone can enjoy it! Source included.