What is the cause of these Visual Studio 2010 errors & warnings?

Question

I don't know the cause of these errors I am receiving from Visual Studio 2010.

This is the code from my program from line 343 to line 408:

int create_den_from_img(char *img_file_name_part, int xlen, int ylen, int zlen )
{
  IplImage* imgs = 0;
  char str[80];
  unsigned char *data,*imgdata;

  /* allocating memory */
  data = (unsigned char *) malloc(xlen * ylen * zlen * sizeof(unsigned char) );
  if(data==NULL)
  {
    printf("error in allocating memory \n");
    exit(1);
  }

  /* Getting the filename & iterating through tiff images */

    for(int k = 0; k < zlen; k++)
    {   
        int count=2;
        int tmp=k+1;
        while(tmp/10)
        {
            count=count-1;
            tmp=tmp/10;
        }

        switch(count)
        {
            case 2:sprintf(str,"%s00%d.tif",img_file_name_part,k+1);
                    break;
            case 1:sprintf(str,"%s0%d.tif",img_file_name_part,k+1);
                    break;  
            default:sprintf(str,"%s%d.tif",img_file_name_part,k+1);
                    break;
        }
        printf("%s\n",str);

        /* Loading Image using OpenCV */
        imgs=cvLoadImage(str,-1);
        if(imgs==NULL)
        {
            printf("error in opening image \n");
            exit(1);
        }
        imgdata=(uchar *)imgs->imageData;

        for(int j =0; j < ylen; j++)
        {
            for(int i =0; i < xlen; i++)
            {
                data[ k*xlen*ylen + j*xlen + i ] = imgdata[ j*xlen+i ];
            }
        }

        cvReleaseImage(&imgs );
    }

    /* populating `data` variable is done. So, calling `write_den` */
    if(write_den("test.den",data,xlen,ylen,zlen)==0)
    {
        printf("Error in creating den file\n");
        exit(1);
    }
    printf("Den file created\n");

}

These are the list of errors:

Error   3   error C2143: syntax error : missing ';' before 'type'   c:\examples\denfile.c   358 1   MTP_TEST
Error   4   error C2143: syntax error : missing ';' before 'type'   c:\examples\denfile.c   358 1   MTP_TEST
Error   5   error C2143: syntax error : missing ')' before 'type'   c:\examples\denfile.c   358 1   MTP_TEST
Error   6   error C2143: syntax error : missing ';' before 'type'   c:\examples\denfile.c   358 1   MTP_TEST
Error   7   error C2065: 'k' : undeclared identifier    c:\examples\denfile.c   358 1   MTP_TEST
Error   9   error C2065: 'k' : undeclared identifier    c:\examples\denfile.c   358 1   MTP_TEST
Error   10  error C2059: syntax error : ')' c:\examples\denfile.c   358 1   MTP_TEST
Error   11  error C2143: syntax error : missing ';' before '{'  c:\examples\denfile.c   359 1   MTP_TEST
Error   12  error C2065: 'k' : undeclared identifier    c:\examples\denfile.c   361 1   MTP_TEST
Error   13  error C2065: 'k' : undeclared identifier    c:\examples\denfile.c   370 1   MTP_TEST
Error   14  error C2065: 'k' : undeclared identifier    c:\examples\denfile.c   372 1   MTP_TEST
Error   15  error C2065: 'k' : undeclared identifier    c:\examples\denfile.c   374 1   MTP_TEST
Error   16  error C2143: syntax error : missing ';' before 'type'   c:\examples\denfile.c   388 1   MTP_TEST
Error   17  error C2143: syntax error : missing ';' before 'type'   c:\examples\denfile.c   388 1   MTP_TEST
Error   18  error C2143: syntax error : missing ')' before 'type'   c:\examples\denfile.c   388 1   MTP_TEST
Error   19  error C2143: syntax error : missing ';' before 'type'   c:\examples\denfile.c   388 1   MTP_TEST
Error   20  error C2065: 'j' : undeclared identifier    c:\examples\denfile.c   388 1   MTP_TEST
Error   22  error C2065: 'j' : undeclared identifier    c:\examples\denfile.c   388 1   MTP_TEST
Error   23  error C2059: syntax error : ')' c:\examples\denfile.c   388 1   MTP_TEST
Error   24  error C2143: syntax error : missing ';' before '{'  c:\examples\denfile.c   389 1   MTP_TEST
Error   25  error C2143: syntax error : missing ';' before 'type'   c:\examples\denfile.c   390 1   MTP_TEST
Error   26  error C2143: syntax error : missing ';' before 'type'   c:\examples\denfile.c   390 1   MTP_TEST
Error   27  error C2143: syntax error : missing ')' before 'type'   c:\examples\denfile.c   390 1   MTP_TEST
Error   28  error C2143: syntax error : missing ';' before 'type'   c:\examples\denfile.c   390 1   MTP_TEST
Error   29  error C2065: 'i' : undeclared identifier    c:\examples\denfile.c   390 1   MTP_TEST
Error   31  error C2065: 'i' : undeclared identifier    c:\examples\denfile.c   390 1   MTP_TEST
Error   32  error C2059: syntax error : ')' c:\examples\denfile.c   390 1   MTP_TEST
Error   33  error C2143: syntax error : missing ';' before '{'  c:\examples\denfile.c   391 1   MTP_TEST
Error   34  error C2065: 'k' : undeclared identifier    c:\examples\denfile.c   392 1   MTP_TEST
Error   35  error C2065: 'j' : undeclared identifier    c:\examples\denfile.c   392 1   MTP_TEST
Error   36  error C2065: 'i' : undeclared identifier    c:\examples\denfile.c   392 1   MTP_TEST
Error   37  error C2065: 'j' : undeclared identifier    c:\examples\denfile.c   392 1   MTP_TEST
Error   38  error C2065: 'i' : undeclared identifier    c:\examples\denfile.c   392 1   MTP_TEST

I've been getting these kind of errors all day long. Sometimes the code compiles, while at other time it doesn't. Its really annoying.

did you copy/past some code from another editor/web browser? I've had problems like this before when there were hidden characters present in the pasted code. — Eric Schweichler, Apr 24 '10 at 22:53
@Eric Schweichler : No, I didn't copy paste this code. Its completely hand written. @Billy ONeal: I too think so. But I'm unable to find error by myself. — volpack, Apr 24 '10 at 22:56
That might be true, but your original question looked like you were bashing MSVC. The original question might have been closed as subjective and argumentative. I have edited it and hopefully it will be better received now. Please revert it if you do not like the edits. — Billy ONeal, Apr 24 '10 at 23:00
Personally, if the compiler can't output helpful error messages, I count it to be a problem with the compiler. And if you have to say things like, "the error message was helpful--anyone who has 5 years of daily Visual C++ experience can interpret it!" (or some such) to defend the compiler, you're only proving my point. — weberc2, Oct 22 '12 at 21:42

score 13 · Accepted Answer · answered Apr 24 '10 at 23:04

13

You're compiling a .c file, which for Microsoft Visual Studio means that you need to be writing C89 (aka C90) code, not C99 code or C++.

What this means is that you must declare your variables at the start of each block. This means that you can't do:

for (int k = 0; ...

You have to declare k at the start of the block and do:

for (k = 0; ...

answered Apr 24 '10 at 23:04

CB Bailey

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Or just compile it as C++ code. It's all valid C++ as well. +1. – Billy ONeal Apr 24 '10 at 23:05
@Billy: Where do I have options to set these various languages? – volpack Apr 24 '10 at 23:12
@Charles Bailey: Where do I find options to set if it should use c89/c99/c++ ? – volpack Apr 24 '10 at 23:15
@Billy: If it's meant to be a C++ source file I'd have thought that it would be simpler to just give it an extension that MSVC recognizes as C++ out of the box, but yes `/TP` is one way. – CB Bailey Apr 24 '10 at 23:17
@volpack: I'm not sure, but you could just rename the file with a `.cpp` extension instead of `.c`. – Billy ONeal Apr 24 '10 at 23:18
@volpack: MSVC doesn't support C99, only C89 + extensions. If you want to write C++ the simplest thing to do is to give the file an appropriate extension (.cpp or .cc). There's also the `/TP` compiler option to force the compiler to treat any source file as a C++ source file. I think that you can control it in the IDE in the property pages for the file IIRC. – CB Bailey Apr 24 '10 at 23:26
1

What?? MSVC doesn't support C99? How come? Its been more than 10 years. Why doesn't it support? AFAIK, compilers compete in the race of "who adds new features first?" – volpack Apr 24 '10 at 23:39
1

MS aren't running in the C race. http://stackoverflow.com/questions/146381/visual-studio-support-for-new-c-c-standards – CB Bailey Apr 24 '10 at 23:51

JRL · Answer 2 · 2010-04-24T23:10:34.623

2

Do you have a missing semicolon after a class/struct declaration before line 343 ?

One thing you can do is try another compiler to see if you get a different error message that speaks more to you. For example, there's Comeau online.

Otherwise, could you have some rogue #defines in your code or some of your includes? Since this doesn't happen all the time, could someone be playing tricks on you? Try to examine the preprocessed output.

edited Apr 24 '10 at 23:10

answered Apr 24 '10 at 22:55

JRL

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Nope. checked thoroughly. I even tried deleting just this code & compiling. It compiles fine. – volpack Apr 24 '10 at 23:00
@JRL: The first error is at the first for loop inside this function -- I think if it was a missing class ending semicolon there'd be an error when int was encountered at the start of the function definition. But good psychic debugging -- this is the first thing I'd check. +1. – Billy ONeal Apr 24 '10 at 23:01

What is the cause of these Visual Studio 2010 errors & warnings?

2 Answers2

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