Problem with enum

**purestr999** · 11-22-2010

I made 2 programs, each both use only <stdlib.h> and <stdio.h>.
I can't find any important differences in them. In the first one I did simple math problems with enum things, and it worked fine, but now in the second one, the compiler complains when i do some enum thing = 0 for example. Here is the codes from both the programs:

program 1:

Code:

//this is outside of main()
enum row {row1,row2,row3,row4,row5,row6,row7,row8,row9};
typedef enum row row;

//this is in main()
row tmprow;

for(tmprow=row1;tmprow<=row9;tmprow++)
        {}

program 2:

Code:

//this is outside of main()
enum country {italy, america, france, brazil, england, newzealand, nepal, switzerland, canada, australia};
typedef enum country country;

//this is in main()
country tmpcountry;

for(tmpcountry=0;tmpcountry<=9;tmpcountry++)
    {}

In the first program my compiler is happy, but in the second one, he complains about each of the 3 parts of the for statement. What did I do wrong? How do I fix the 2nd program? Thanks for the help

**rags_to_riches** · 11-22-2010

This:

Code:

#include <stdio.h>
#include <stdlib.h>

enum country {italy, america, france, brazil, england, newzealand, nepal, switzerland, canada, australia};
typedef enum country country;

int main(void)
{
    country tmpcountry;

    for(tmpcountry = 0; tmpcountry <= 9; ++tmpcountry)
        printf("%d\n", tmpcountry);
    return 0;
}

compiles fine for me under gcc with the -Werror and -pedantic flags. Although I'm not a fan of using the same name for the enum and the typedef of the enum.

What are the errors you're getting exactly.

**purestr999** · 11-22-2010

I am getting casting errors.

error: invalid conversion from 'int' to 'country'

and

error: no 'operator++(int)' declared for postfix '++', trying prefix operator instead
error: no match for 'operator++' in '++tmpcountry'

rags_to_riches: I copied your code into a nice fresh file and got the same errors again!

**Salem** · 11-22-2010

> error: no 'operator++(int)' declared for postfix '++', trying prefix operator instead
> error: no match for 'operator++' in '++tmpcountry'
C doesn't do operator overloading, so my guess is you're compiling your C program with a C++ compiler.

The enum rules in C++ are stricter.

**purestr999** · 11-22-2010

I am using Codeblocks, with GNU GCC compiler.
And I have both the programs open in different tabs, but one compiles, and the other doesn't!

I think that maybe the working program I copied from another computer. So maybe that computer was configured right but mine isnt?
How do I make my compiler know I am progamming in C then? It is using GNU GCC compiler, and I am naming my files XXX.c

**Salem** · 11-22-2010

Are you running c::b on an OS that has case-sensitive filenames (like Linux)?

Code:

$ cat foo.c
#include<stdio.h>
int main ( ) {
#ifdef __cplusplus
  printf("Compiled as C++\n");
#else
  printf("Compiled as C\n");
#endif
  return 0;
}
$ gcc foo.c && ./a.out 
Compiled as C
$ gcc -x c++ foo.c && ./a.out 
/tmp/cc7f3LHw.o:(.eh_frame+0x12): undefined reference to `__gxx_personality_v0'
collect2: ld returned 1 exit status

Now try with upper case .C
$ cp foo.c foo.C
$ gcc foo.C && ./a.out 
/tmp/ccoqURep.o:(.eh_frame+0x12): undefined reference to `__gxx_personality_v0'
collect2: ld returned 1 exit status
$ gcc -x c foo.C && ./a.out 
Compiled as C

Check your compiler settings.
Make sure you're not invoking g++ instead of gcc
Make sure you're not passing say -x, which will change the language detection.

Consider adding -v to see what is really going on

Code:

$ gcc -v foo.c
Using built-in specs.
Target: i486-linux-gnu
Configured with: ../src/configure -v <<much more output snipped>>

**purestr999** · 11-23-2010

I am using windows 7 with codeblocks 8.02 which I downloaded and installed a couple weeks ago. I didn't change any settings.

I ran your code, and it says compiled in C++.

By the way, I found that if I make a project, and during the wizard I chose C, then the enum code does compile. But if I make a file, and during the wizard I chose C, then it doesn't compile.

In settings, compiler and debugging, it says GNU GCC Compiler from the drop down box.

What do I have to do to make my programs compile in C? Can you tell me the specific setting that I should change or something? I am not that experienced in this stuff.

I can't create all my files in projects because I need to turn these in for homework, and I am supposed to turn in just the .c file.

I searched everywhere in the settings for how my first program which works(that I think I started making on another computer) is different from all my new programs.

By the way, I have no idea where to type -v and -o and all that stuff, or is that only linux related?

Thanks for the help

P.S. lol, even if I copy the working file and paste it (not in codeblocks, i mean the actual file) the new copy won't build, it gets all the enum errors.

**purestr999** · 11-24-2010

can someone tell me how to change the settings so that my files are compiled in C? I am using GNU GCC in codeblocks but stuff compiles in C++

**Bayint Naung** · 11-24-2010

Check your compiler/IDE documentation.

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