Write a for loop that can be used to enter values of time in minutes in the foll

Question

Write a for loop that can be used to enter values of time in minutes in the following array and display the values after converting to hours: int time [100] Write a code fragment declaring the following object as of stream object and opening it as a text output file: coupons. txt. Also check if the file opened correctly or not. C++ Standard Template Library (STL) provides a vector class. Which 4 header files need to be included in your program to construct strings and to create and manipulate vector objects?

Explanation / Answer

(a)
   .........
  
   //Array to hold time in minutes
    int time[100];

    //Array indexing variable
   int i;

   //Iterate over array
   for(i=0; i<100; i++)
   {
        //Reading time in minutes
       cout << endl << " Enter time in minutes: ";

       //Storing in array
       cin >> time[i];
   }

   cout << endl << endl;

   //Iterating over array
   for(i=0; i<100; i++)
   {
        //Converting time into hours and printing to console
        cout << " " << time[i] << " minutes   =   " << time[i] * 0.0166667 << " hours " << endl << endl;
   }

   ..........
  
_________________________________________________________________________________________________________________________

(b)
  
   //Creating an object of ofstream class
    ofstream fout;

    //Opening file coupons.txt as a text file
    fout.open("coupons.txt", ios::out);

    //Checking if file opened correctly or not...
    if(fout.is_open())
    {
        //File opened correctly
        cout << " File Opening successful ...";
    }
    else
    {
        //Problem in opening file
        cout << " Error!! Opening file ...";
    }

    //Closing file
    fout.close();

_________________________________________________________________________________________________________________________

(c)

   Four header files needed to construct strings and to create and manipulate vectors:
  
   (1) <iostream>:
  
       -> This header file includes input / output library.
       -> All the methods related to input and output operations are included in this header file.
  
  
   (2) <cstdlib.h>:
  
       -> This was originally in C library <stdlib.h>.
       -> It provides different type of utilities like Memory management(malloc, calloc, free, etc..) , String to numeric conversion (atof, atoi, etc...)

  
   (3)   <string>:
       -> This header file includes string library.
       -> It provides methods (getline, operator<< , operator>> etc) for working with strings

   (4) <vector>
       -> This header file is a part of containers library.
       -> It provides methods (push_back(), at(), etc) for working with vectors

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