help counting characters

This is a discussion on help counting characters within the C++ Programming forums, part of the General Programming Boards category; Hi. I am having a problem. What I am trying to do is input a text file. From the file ...

  1. #1
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    help counting characters

    Hi. I am having a problem. What I am trying to do is input a text file. From the file I want to find out how many words are on there and then I want to know how many characters are in the text file for each letter. For example :the dog.

    That has 1 t, 1 h, 1 e, 1 d, 1 o, 1 g, 1 .

    Then i need to output the text from the file to the screen and then output how many words and each of the letters in alphabetical order.

    How can i do that? So far all I have been able to do is count how many words but I cannot find a way of how to count the characters or anything. Can anyone help?

    This is my code:
    Code:
    #include <iostream>
    #include <fstream>
    #include <string>
    using namespace std;
    
    int main()
    {
    string word;
    int count=0;
    ifstream fin;
    
    fin.open("input.txt");
    
    if (fin.fail())
    {
    cout<<"Couldn't read file. \n";
    cin.get();
    return 0;
    }
    
    while(!fin.eof())
    {
    fin>>word;
    cout<<word<<" ";
    ++count;
    }
    
    
    cout<<"\nThere are: "<<count<<" words";
    fin.close();
    
    cout<<"\nPress enter to exit";
    cin.get();
    return 0;
    
    }

  2. #2
    C++まいる!Cをこわせ! Elysia's Avatar
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    Read character-by-character, store the character in a map paired with an int that contains its count. Then try to lookup the character you read and, if found, increase its count, and so on.
    For words, just read word-by-word (what you're doing now) and increase count.

    Refer to site tutorials for help on maps and such.
    Also, fin.eof() is bad for loop condition. See FAQ.
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.

  3. #3
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    is there any other way of doing it without using map? I'll say it now, I am trying to do this for homework and I know writting the code for me is not right. But I need help in direction. is there anyway of doing it just using loops and commands from strings, arrays, and file i/o?
    Last edited by dom89; 12-08-2007 at 04:53 PM.

  4. #4
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    hint: try to index an array by character.
    Code:
    int count[256] = { 0 };
    ...
    count['a']++;
    ...

  5. #5
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    thanks cyberfish. With the array I was able to count how many of each letter there is. Now how can I limit the output to only output the ones that have a value greater than 1? If the letter is not in the text, I would like to not print it out. How would I do that also with the characters? including the difference when they are CAPS or lower case?

    here is my new code after i added the arrray

    Code:
    #include <iostream>
    #include <fstream>
    #include <string>
    using namespace std;
    
    int main()
    {
    	string word;
    	int letter[126]={0};	
    	int count=0, a;
    	char ch[126];
    	ifstream fin;
    
    	fin.open("input.txt");
    		
    	if (fin.fail())
    	{
    		cout<<"Couldn't read file. \n";
    		cin.get();
    		return 0;
    	}
    	
    	while(!fin.eof())
    	{
    		fin>>word;
    		cout<<word<<" ";
    		++count;
    		a=word.length();
    		
    		for(int i=0; i<a;++i)
    		{
    			ch[i]=word[i];
    			++letter[ch[i]];
    	
    		}	
    		}
    	
    	cout<<"\nThere are: "<<count<<" words";
    	for(int i=0; i<126;++i)
    		{
    			
    		cout<<" "<<letter[i]<<endl;
    		}
    	
    	fin.close();
    	
    	cout<<"\nPress enter to exit";
    	cin.get();
    	return 0;
    	
    }
    Last edited by dom89; 12-08-2007 at 05:59 PM.

  6. #6
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    Code:
    for (char i = 'a'; i <= 'z'; ++i) {
         if (count[i] != 0) {
              ...
         }
    }
    use another loop for uppercase letters.
    Last edited by cyberfish; 12-08-2007 at 09:26 PM.

  7. #7
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    thanks cyberfish. that helped me out a lot. Now since I want to include such things as periods, all i have to do is set the initial value to "!" and the last value to "z". Am i correct?

  8. #8
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    yes, that would work.

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