Question

C++

Can someone please help me with this problem- commenting each line of code so I can understand how to solve this problem using the C++ programming language?

I really need help understanding how to create a file for the program to read. Do I create the file in Visual basic or create a text file? I have the code, just need to know how to create the file for it to read.

#include<fstream>
#include<iostream>
using namespace std;
int main()
{
ifstream fin;
ofstream fout;
char ch;
int arr[26];
int no_of_lines=1;//declare all variables
fin.open("abc.txt");//open file for reading
fout.open("demo.txt");//open file for writing
for(int i=0;i<26;i++)//keep all arrray values zero at first you can also use memset instead of this
arr[i]=0;
while(!fin.eof())//while the file end comes
{
fin.get(ch);//read from source
fout.put(ch);//put it in output file
if(ch=='\n')
{
//if it is a new line increment this
no_of_lines++;
continue;
}
if(ch>='a'&&ch<='z')//all values are recorded as capitals
ch=ch-32;//convert it into capitals by reducing ascii value
int p=ch-65;//it will take A position 0 b as 1 etc..
if(ch>='A'&&ch<='Z')//if it is a alphabet only we wiil increment else not
arr[p]++;
  
}
cout<<"\nData written successfully..."<<endl;
cout<<"The number of lines in the input file is "<<no_of_lines<<endl;//print the information
for(int i=0;i<26;i++)
{
if(arr[i]==0)
continue;
char ch=65+i;
cout<<ch<<" appears "<<arr[i]<<" times"<<"\n";
}
fout.close();
fin.close();

}
output

Answer 1

This problem is related to file operations in c++, where we read data from file and after some manipulation we put it in another file.

You need to create a "abc.txt" file and write contents to it such that when you open it in read mode you can read the data from it, then you can directly write the content to "demo.txt", you dont need to create it, program wil automatically create it. In windows you can create a txt file by giving it a name and selecting the correct extensions like .txt.

Feel free to ask if you have any doubts in comment section.

HOPE YOU LIKE THE SOLUTION!!!