Thread: Finding the most common char

How do I find out the most common char and how often it occurs in a textfile?

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Code:

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

int main()
{
   char c;              
   int up_ct = 0;   
   int low_ct = 0;
   int dig_ct = 0;               
   int n_words = 0;     
   int punc_ct = 0;     
   int rows = 1;
   int total = 0;
   bool inword = false;
   FILE *fp;

   fp = fopen("e:\\test.txt", "r");

   while ((c = getc(fp)) != EOF)
   {
        if (islower(c))
           low_ct++;
        else if (isupper(c))
           up_ct++;
        else if (isdigit(c))
           dig_ct++;
        else if (ispunct(c))
           punc_ct++;
        else if ('\n' == c)
           rows++;
           
      if (!isspace(c) && !inword)
      {
         inword = true;  
         n_words++;                
      }
      
      if (isspace(c) && inword)
         inword = false; 
   }
   
   total = up_ct + low_ct + dig_ct;
   
   printf("\nwords = %d, totalchar = %d, lowercase = %d, uppercase = %d "
          "digits = %d, punctuation = %d, rows = %d",
           n_words, total, low_ct, up_ct, dig_ct, punc_ct, rows);
          
   fclose(fp);
   return 0;
}

A blunt way of doing this would be to create an array of integers to represent each character, then switch after each getc, and increment the integer representing that letter.

int *n;

n = (int *) malloc( sizeof( int ) * ( 'z'-'A'));

c = getc(fp)....

switch( c )
{
case('a'): n['a' - 'A']++;
break;
.
.
.
}

I may have the letters the wrong way round (I can't remember whether 'A' or 'a' comes first in the ascii listing, and I can't get to a compiler at the moment.