Question

In this exercise you will be designing a program in c++ that does the following:

Prompts the user for a file name and then shows the user with the number of word in the file. The program should then allow the user to repeatedly specify a number and the program should show that word in the file.

For example, if the file contained the text: Hello. This is the text that is contained in this file.
A sample run of the program might look like this:

Enter file name: in.txt
File contains 10 words. Which one would you like to see? (Enter 0 to exit): 5
The 5th word is "text".
Which word would you like to see next: 0
Good bye!

Note: You may not use an array or any other aggregate structure to store all the numbers as a whole

• For this first part of the exercise, you will use functional decomposition to develop the logic/algorithm and functions that you will use. You are not writing code at this point. You are simply determining the logical flow of your program and what functions the program should use.

Answer 1

/*C++ program that prompts user to enter the name of the file and then ask to enter the word
to see and print the word to console. The program continues until user enters 0 to exit*/
//main.cpp
//include header files iostream
#include<iostream>
#include<string>
#include<fstream>
using namespace std;
string getnthterm(string filename, int nvalue);
int main()
{
   string filename;
   string word;
   cout<<"Enter file name: ";
   getline(cin,filename);

   int numWords=0;
   int n;

   ifstream fin;
   //open file for reading
   fin.open(filename);
   //check if file not exists
   if(!fin)
   {
       cout<<"File not found"<<endl;
       system("pause");
       return -1;
   }
   //Count words
   while(fin>>word)
   {
       numWords++;
   }

   fin.close();

   cout<<"File contains "<<numWords<<" words.";
   cout<<"Which one would you like to see?(Enter 0 to exit): ";
   cin>>n;
   //read till n is not 0
   while(n!=0)
   {
       cout<<"The "<<n<<"th word is "<<getnthterm(filename,n)<<endl;
       cout<<"Which one would you like to see?(Enter 0 to exit): ";
       cin>>n;
   }

   cout<<"Good bye!"<<endl;
   system("pause");
   return 0;
}
string getnthterm(string filename, int nvalue)
{
   ifstream fin;
   fin.open(filename);
   string word;
   int count=0;
   //Count words
   while(fin>>word && count++<nvalue-1);
   //close the file
   fin.close();
   //return word
   return word;

}

in.txt

Hello. This is the text that is contained in this file.

Sample Output:

Enter file name: in. txt File contains 11 words. Which one would you like to see? (Enter 0 to exit): 1 The 1th word is Hello. Which one would you like to see? (Enter 0 to exit): 2 The 2th word is This Which one would you like to see? (Enter 0 to exit): 3 The 3th word is is Which one would you like to see? (Enter 0 to exit): 4 The 4th word is the Which one would you like to see? (Enter 0 to exit): 5 The 5th word is text Which one would you like to see? (Enter 0 to exit): 0 Good bye! Press any key to continue . ..