如何为Unix创建Makefile

Question

Ok I keep receiving the following error message:

g++    -c -o guess.o guess.cpp
guess.cpp: In function ‘int main()’:
guess.cpp:70:7: error: expected ‘}’ at end of input
   }
   ^
guess.cpp:70:7: error: expected ‘}’ at end of input
guess.cpp:70:7: error: expected ‘}’ at end of input
make: *** [guess.o] Error 1

It is referring to the last part of my code which is:

 cout << "Think of an integer between 1 and 1000. I will try to guess it." << endl;

  bool result = doGuesses(0, 1001);
      {
  if (!result) 
               {
    cout << " and is between 1 and 1000." << endl;
    cout << "\n\nI demand a rematch!" << endl;
               } 
        }

I have deleted the } and added it back and I still continue to get the same error message. What am I doing wrong?

Answer 1

MAKEFILE

This looks good to me. There are a couple of issues though.

 guess:yesno.o guess.o g++ guess yesno.o guess.o 

g++ needs the -o option to name the output file. It's the same syntax as if you'd run it in the command line. And I'd put a space after the colon. But I'm not sure if that's mandatory.

 guess.o: yesno.h yesno.o: yesno.h 

guess.o and yesno.o also need the dependency with their respective cpp files.

Like this:

guess.o: guess.cpp yesno.h

Answer 2

The errors speak for themselves.

Your include guard tries to test an invalid macro name, yesno.h . It should be yesno_h , to match the following definition.

Your header tries to include itself, but as a system header. It shouldn't do that.

You want something more like

#ifndef yesno_h
#define yesno_h

// Return true if response is "yes", "y", or any upper/lowercase
// variant of those two strings.
bool yesNo (std::string response);

#endif