bug750.cpp

1    #include <stdio.h>
2
3    #define ON_THE_ROCKS
4
5    const char *ice()
6        {
7    #if defined(Shaken)
8        return "shaken not stirred";
9    #elif defined(Stirred)
10       return "stirred not shaken";
11   #elif defined(ON_THE_R0CKS)
12       return "on the rocks";
13   #else
14       return "";
15   #endif
16       }
17
18   int main()
19       {
20       printf( "Celebrate the New Year " );
21       printf( "with your drink %s.\n", ice() );
22       return 0;
23       }

The New Year's celebration was marred by the lack of ice for the drinks. The compiler made no complaint. Can you discover the problem?

bug750.cpp lint Output

--- Module:   bug750.cpp (C++)

    --- Wrap-up for Module: bug750.cpp

Info 750: local macro 'ON_THE_ROCKS' (line 3, file bug750.cpp) not referenced

Reference Manual Explanation

750    local macro 'Symbol' (Location) not referenced  -- A 'local'
       macro is one that is not defined in a header file.  The macro was
       not referenced throughout the module in which it is defined.