Compile error about MACRO

This is a discussion on Compile error about MACRO within the C Programming forums, part of the General Programming Boards category; Hello everyone, The compile error of the following code is, foo.cpp(7) : error C2146: syntax error : missing ';' before ...

  1. #1
    Registered User
    Join Date
    May 2006
    Posts
    1,579

    Compile error about MACRO

    Hello everyone,


    The compile error of the following code is,

    foo.cpp(7) : error C2146: syntax error : missing ';' before identifier '_'
    foo.cpp(7) : error C2065: '_' : undeclared identifier
    foo.cpp(7) : error C2143: syntax error : missing ';' before 'string'

    I do not know why there is errors. I think in MERGE macro, the value of parameter a is hello and the value of parameter b is world in my case, and I defined hello_world to "H E L L O", it should be fine...

    Any ideas?

    Code:
    #define MERGE(a,b)  a ## _ ## b
    #define hello_world "H E L L O"
    
    int foo()
    {
    	char* p0;
    	p0 = MERGE("hello", "world");
    
    	return 0;
    }

    thanks in advance,
    George

  2. #2
    Registered User
    Join Date
    Oct 2001
    Posts
    2,129
    Code:
    #define MERGE(a,b)  a ## _ ## b
    #define hello_world "H E L L O"
    
    int foo()
    {
        char* p0;
        p0 = MERGE(hello, world);
    
        return 0;
    }

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