counting letters in string

This is a discussion on counting letters in string within the C Programming forums, part of the General Programming Boards category; Hi I'm trying to create a program that reads in a block of text from the keyboard, analyze the text ...

  1. #1
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    Unhappy counting letters in string

    Hi
    I'm trying to create a program that reads in a block of text from the keyboard, analyze the text and display the output in the format shown below. However i have to use two arrays one is a character holder (each time a new character is found it will be placed in that array. Only one of each character may be placed in the array). the second array is a count array. i am allow to use isalpha function.

    character count
    H 3
    r 2
    u 3
    . .
    . .

    This is the code i have so far

    Code:
    #include "stdafx.h"
    #include "stdio.h"
    
    int _tmain(int argc, _TCHAR* argv[])
    {
    	#define ALPHABET_TOTAL 26                    /* The total number of letters in the alphabet */
    	
    		int text[ALPHABET_TOTAL] = {0},        /* Array sized 26, acting as counters for all characters 'a' .. 'z'  (case insensitive) */     
             text_input,                        /* Reads in the text input as characters */
             ASCII_count,                       /* The ASCII numerical representation of letters in the alphabet */
             alpha;                             /* boolean "flag" which turns to 0 (false) in case of a non-alpha character */
    		
    		
    	/* Initialization */
          
          text_input = 0;
          ASCII_count = 0;
          alpha = 0;
    
          /* Get input */
          
          printf("\nPlease enter text.  Terminate program using Ctrl+Z: ");
          
          while( text_input != EOF )
          {
            alpha = 1; 
            text_input = getchar();    
            
          /* If input is alphabetical, convert to a number 0-25 so that it can be used as an array index locator */
          
          if(text_input >= 'a' && text_input <= 'z')
           text_input -= 'a';
          else if(text_input >= 'A' && text_input <= 'Z')
           text_input -= 'A';
    
          /* Non-alphabetical character, set the alpha flag to false */
        
          else
           alpha = 0;
    
          /* Increment the appropriate counter in the text array as long as the character is alphabetical */
        
          if(alpha)
           text[text_input]++;
         }
         
         /* Display results */
         
        for (ASCII_count; ASCII_count <= 25; ASCII_count++)
         printf("\nTotal %c or %c: %d", ASCII_count + 'a', ASCII_count + 'A', text[ASCII_count]);
    	for(;;);
    }
    The problem is that i don't want to display all the letters in the alphabet only the ones that appear in the text. Also I need to come up with a way to differentiate lower case from upper case.

    Any help would be greatly appreciate it.

    Thanks

  2. #2
    and the hat of wrongness Salem's Avatar
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    How about
    if ( text[ASCII_count] != 0 )
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
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