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how to count characters inside tags in a html file?

ch175 (1)
I want to be able to count the characters inside the tags in the html file. I can get the total of the whole file characters but not the total of the characters inside the tag. how could I do this? here is what I have so far

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  #include <iostream>                // include standard I/O libraries
#include <iomanip>
#include <fstream>
#include <string>
using namespace std;

int main ()
{	
	int numlines = 0,		// counts the number of lines
		linkcount = 0,		// counts the number of links
		tagcount = 0,		// counts the number of tags
		comment = 0,		//counts hte nuber of comments
		numchars = 0,		//counts the number of characters
		numtagchars = 0;
	ifstream inFile;		//streams file name
	string filename,		//input for the file name
		   line;			//reads the lines in the file
	bool inTag = false;
	const char openTag = '<',
			   closeTag = '>';
	char ch;
	//displays header

	cout << "=========================================================================\n"
		 << "HTML File Analyzer\n"
		 << "=========================================================================\n"
		 << endl
		<< "Enter a valid filename (No blanks!): ";
	cin >> filename;
	inFile.open(filename.c_str());

	//while the incorrect name is entered
	while(!inFile){
	cout << "Re-enter a valid filename (No blanks!): ";
	cin >> filename;
	inFile.open(filename.c_str());
	}

	cout << endl
		 << "=========================================================================\n"
		 << "Text of the file\n"
		 << "=========================================================================\n"
		 << endl;

	//diplays the file text
	while(getline(inFile, line)){
		cout << line << endl;
		numlines++;
		//counts the tags in the file
		for (unsigned int tag = 0; tag < line.length(); tag++){
			if(line.at(tag) == '<'){
				tagcount++;
			}
		}
		// counts the comments in the file
		for (unsigned int com = 0; com < line.length(); com++){
			if(line.at(com) == '<'){
				if(line.at(com + 1) == '!'){
				comment++;
				}
			}
		}

		//counts the links in the file
		for (unsigned int lin = 0; lin < line.length(); lin++){
			if(line.at(lin) == '<'){
				if(line.at(lin + 1) == 'l'){
					if(line.at(lin + 2) == 'i'){
					linkcount++;
					}
				}
			}
		}
		//counts the chars in the file
		for (unsigned int chars = 0; chars < line.length(); chars++){
			if(line.at(chars)){
			numchars++;
			}
		}

		//No clue how to do it here//
		/*for (unsigned int tagchars = 0; tagchars < line.length(); tagchars++){
			if(line.at(tagchars) == '<'){
					numtagchars++;
				
			}
		}*/
		
	
	}

	
		cout << endl
			 << "=========================================================================\n"
			 << "End of the text\n"
			 << "=========================================================================\n"
			 << endl;
	
	cout << "Analysis of file"
		 << endl
		 << "----------------"
		 << endl
		 << endl;

			//displays summary of file
	numchars+=numlines;
	cout << "Number of lines: " << numlines << endl
		 << "Number of tags: " << tagcount << endl
		 << "Number of comments: " << comment << endl
		 << "Number of links: " << linkcount << endl
	     << "num of chars " << numchars << endl
		 << "num of tagchars " << numtagchars << endl;
		cout << endl;



	inFile.clear();
	inFile.close ();
	cout << endl 
		 << "=========================================================================\n"
		 << "Thanks for using the HTML File Analyzer\n"
		 << "=========================================================================\n"
		 << endl;
	
	return(0);

}
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