Question

Can someone help me write a C++ program such that:

1. It counts the number of alphabetic characters in a text file; this mean it ignores any character that is not alphabetic

2. Prompts the user to write the name of the file

3. Count's the number of A's, B's, C's, ..and so on

For the sake of this program, both capital 'A' and lowercase 'a' and treated as equal.

An output would something like this

"A's = 10

B's = 25

C's = 24

D's = 54

etc..."

Answer 1

Here is the completed code for this problem. Comments are included, go through it, learn how things work and let me know if you have any doubts or if you need anything to change. If you are satisfied with the solution, please rate the answer. Thanks

//Code

#include<iostream>

#include<fstream>

using namespace std;

int main(){

              //initializing an array to store counts of all alphabets

              //also assigning value 0 as default

              int counts[26]={0};

              //array to store file name

              char filename[50];

              //prompting and reading filename

              cout<<"Enter filename: ";

              cin>>filename;

              //opening file in read mode

              ifstream inFile(filename);

              //checking if file opened correctly

              if(!inFile){

                           //error

                           cout<<"File not found!"<<endl;

                           return 0;

              }

              char ch;

              //looping and reading all characters one by one

              while(inFile>>ch){

                           //checking if character is an alphabet

                           if(ch>='A' && ch<='Z'){

                                         //upper case letter, subtracting by 'A' to get a value between 0 and

                                         //25, which we can use as an index value to access counts array

                                         int index=ch-'A';

                                         //incrementing counter at index 'index'

                                         counts[index]+=1;

                           }else if(ch>='a' && ch<='z'){

                                         //lower case letter, subtracting by 'a' here to get a value (0-25)

                                         int index=ch-'a';

                                         counts[index]+=1;

                           }

              }

              //closing input file

              inFile.close();

             

              char c='A';

              //looping and printing count of each character

              cout<<endl;

              for(int i=0;i<26;i++){

                           cout<<c<<"'s = "<<counts[i]<<endl;

                           c++; //next character

              }

              return 0;

}

/*OUTPUT*/

Enter filename: dataa.txt

A's = 33

B's = 7

C's = 16

D's = 6

E's = 34

F's = 7

G's = 4

H's = 19

I's = 17

J's = 0

K's = 2

L's = 10

M's = 10

N's = 18

O's = 22

P's = 9

Q's = 1

R's = 18

S's = 24

T's = 36

U's = 10

V's = 0

W's = 4

X's = 1

Y's = 1

Z's = 0