Nested Comments in C++

Question

This should be a common problem and possibly similar to some question here but i am looking foe the best way to comment out multiple lines (rather methods ) in C++ which hav

Answer 1

The stuff between the #if 0 and #endif will be ignored by the compiler. (Your preprocessor might actually strip it out before the "compiler" can even take a look at it!)

#if 0

    /* 42 is the answer. */

    Have you tried jQuery?

    @Compiler Stop ignoring me!!

#endif

---

You'll have better control if you use #ifdefs:

// #define DEBUG


#ifdef DEBUG
   MyFunction();
   std::cout << "DEBUG is defined!";
#endif


// Later in your code...

#ifdef DEBUG
    std::cout << "DEBUG is still defined!";
#endif

Just uncomment the first line, and your #ifdef DEBUG code will suddenly be visible to the compiler.

---

P.S. This should clear any more confusion:

/*
    cout << "a";
    /*
        cout << "b";
    */
    cout << "c";
*/

The output should be "c", assuming your compiler doesn't give you any errors for the last */.