Thread: converting to CAPS from a text file

Hey guys,

I'm trying to find a way to count all the alphabetic (letters) in a certain text file. Then, convert them to uppercase and display the number of times that letter appears in that text. I'm attaching the text file as it is hard coded.

here is what I have so far:

Code:

const int LIMIT = 128;

	ifstream inStream;
	
                int lettersArray[LIMIT];
	int i;
                char c;

	inStream.open("darwin.txt");

	if( inStream.fail() )
	{
		cout << "The input file, failed to open. Exiting....\n\n";
		exit(-1);
	}

	for ( i=0; i<LIMIT; i++ )
	{
		lettersArray[i] = 0;
	}

	cout << "The input file contains: \n";
	
	while( inStream >> c)
	{
		lettersArray[c]++;
	}

	cout << endl;

	cout << "The non-zero table of values for printable characters are: \n";

	for( i=0; i<LIMIT; i++ )
	{
		if( isprint(i) && (lettersArray[i] !=0) )
		{
			cout << (char)i << ":" << lettersArray[i] << ";" ;
		}
		cout << endl;
	}
}

this unfortunately counts and shows ALL the characters in the text. I'm not sure if there is a function that selects only the letters, but I know I have to us 'toupper()' somewhere.

any help?

axon

Thanks Salem! I figured out the CAPS conversion, but couldn't get the alphatical characters...now it works fine!

thanks a lot!

axon

Salem or anyone else: I made the code with Salem's help, but I don't think I understand everything fully. How does the program exactly count all the instatnces that a certain letter appears? Where exactly in my code does this happen.

I get this a lot...I write my code by trial and error and then I don't know what is going on. any suggestions? explanations?

axon

here is the complete code again

Code:

	const int LIMIT = 128;
	int sum;

	ifstream inStream;
	int lettersArray[LIMIT];
	char c;
	int i;

	inStream.open("darwin.txt");

	if( inStream.fail() )
	{
		cout << "The input file, failed to open. Exiting....\n\n";
		exit(-1);
	}

	for ( i=0; i<LIMIT; i++ )
	{
		lettersArray[i] = 0;
	}

	cout << "The input file contains: \n";
	
	while( inStream >> c)
	{
		lettersArray[toupper(c)]++;
		//cout << c << " ";
	}

	cout << endl;

	cout << "The table of alphabetic characters is: \n";

	for( i='A'; i<='Z'; i++ )
	{
			cout << (char)i << ":" << lettersArray[i] << ";" ;
			cout << endl;
	}
	cout << endl;