Question

Query the user for the name of a file. Open the file, read it, and count and report the number of vowels found in the file. Using C++.

Answer 1

C++ Program:

/* C++ Program that counts number of vowels in the file */

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

using namespace std;

//Main function
int main()
{
    char ch;
    string fileName;
    int vowelCount=0, aCnt=0, eCnt=0, iCnt=0, oCnt=0, uCnt=0;

    //Reading file name
    cout << "\n Input file name: ";
    cin >> fileName;

    //Opening file in read mode
    fstream fin(fileName, ios::in);

    //Checking for file existence
    if(fin.fail())
    {
        //Printing error message
        cout << "\n Error!!! Cannot read input file... \n";
        return -1;
    }

    //Fetching data from file
    while(fin.good())
    {
        //Reading character from file
        fin >> ch;

        //Checking for character
        switch(ch)
        {
            //Vowel 'a'
            case 'a':
            case 'A':   aCnt++; vowelCount++; break;

            //Vowel 'e'
            case 'e':
            case 'E':   eCnt++; vowelCount++; break;

            //Vowel 'i'
            case 'i':
            case 'I':   iCnt++; vowelCount++; break;

            //Vowel 'o'
            case 'o':
            case 'O':   oCnt++; vowelCount++; break;

            //Vowel 'u'
            case 'u':
            case 'U':   uCnt++; vowelCount++; break;

            default:    break;
        }
    }

    //Printing final report
    cout << "\n\n Total number of Vowels: " << vowelCount;
    cout << "\n\n Vowel 'A': " << aCnt;
    cout << "\n\n Vowel 'E': " << eCnt;
    cout << "\n\n Vowel 'I': " << iCnt;
    cout << "\n\n Vowel 'O': " << oCnt;
    cout << "\n\n Vowel 'U': " << uCnt;

    cout << "\n\n";
    return 0;
}

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Sample Output: