#include <iostream>
#include <fstream>
#include <string>

using namespace std;

const char FileName[] = "c:\\TestCount.txt";

int main () {
string lineBuffer;
ifstream inMyStream (FileName); //open my file stream

if (inMyStream.is_open()) {
       //create an array to hold the letter counts
       int upperCaseCount[26] = {0};

       //read the text file
       while (!inMyStream.eof() ){

              //get a line of text
              getline (inMyStream, lineBuffer);

             //read through each letter in the lineBuffer
             char oneLetter;
             for( int n=0; n < lineBuffer.length(); ++n ){
                    oneLetter = char( lineBuffer[n] ); //get a letter
                    if (oneLetter >= 'A' && oneLetter <='Z') { //decide if it is a capital letter
                          upperCaseCount[int(oneLetter)- 65]++; //make the index match the count array
                    }
            }
        }

        inMyStream.close(); //close the file stream

        //display the counts
        for (int i= 0; i < 26; i++)
                cout << char(i + 65) << "\t\t" << upperCaseCount[i] << endl;
        }
        else cout << "File Error: Open Failed";

       return 0;
}

#include <iostream>
#include<map>
#include <cctype>
#include <string>

using namespace std;

int main() {
map<char, int> chars;
string input;
cout << "Enter a string to count: ";
cin >> input;
for (int i = 0; i < input.length(); i++) {
    if (isalpha(input[i])) {
        chars[input[i]]++; //add one
    }
}
//do something with the data here...

return 0;
}