From: zappaz AT xtra DOT co DOT nz
Newsgroups: comp.os.msdos.djgpp
Subject: Why why why??? (help me with this code....)
Date: Sun, 22 Mar 1998 09:16:19 GMT
Organization: Customer of Telecom Internet Services
Lines: 36
Message-ID: <6f0c4b$a9p$1@wolfman.xtra.co.nz>
NNTP-Posting-Host: p40-m13-mdr1.dialup.xtra.co.nz
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
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I'm using DJGPP on Win95 platform and this little procedure is giving
me a real headache. All it does is return a frequency table (array of
longs) of how often each byte appears in the file "namein". If I
include the line marked with ' > ' then the following while loop never
gets executed. ? Also, if I include the line marked with ' >>> ' the
program crashes, even if the ' > ' line _is_ included. ? ? Compiles
OK.



long *frequencyTable(char *namein) {
      FILE *infile;
      int c;
      long *freq;
      memset(freq,0,2);

      infile = fopen(namein,"r");
      printf("Opening %s successful.\n", namein);
>    for (int i=0;i<256;i++) freq[i]=0;
      while((c=getc(infile))!=EOF)
         {  
            printf("got \"%c\"\n",c);  // not really neccesary
>>>      freq[c]++;
         }
     fclose(infile);
     return freq;
}


Also, I've often noticed that adding a printf statement in a loop
makes a big difference to how that loop runs (usually the difference
between running or not running at all). Is this just something strange
with DJGPP or is there something I don't know?

Thanks in advance, Chris.