Question

C++ and there has to be a FUNCTION to get all the integers.

Suppose there is a file called MidtermExam.txt that is full of integers. Write a program that complies with the following instructions:

Write a function that you will later call in main. Your function is to read from the file all the integers and print to the screen the total of all the numbers in the file, and the average with 2 significant digits after the decimal point.
If your program is unable to access the file, you should tell the user that (show a message) and then shut down the program.
When you are done reading from the file, give the commands to close the file.
Note: I did not forget to attach an input file. You can use the one in lecture 6's module if you want, or create dummy file yourself. I am interested in your code.

Answer 1

Hello!

I have used the function so that

• Reads all the integers from file
• Checks whether it can be accessed or not
• If can access then reads all the integers to an array
• Calculates the total of all integers and prints the total
• Calculates the average of all integers and prints the average

Some method used in the code

ifstream is used to read files as our code requires only reading operation we used ifstream

ifstream file; // file is a variable name

file.open("fileName.ext"); // this opens the file mentioned

file.is_open() returns true if file is opend, or else false if we cannot able to open or access it.

file.is_eof() // returns true when the cursor reaches at the end of the file ,

file >> num1 // moves the data integer to num1 from the file

So finally at the end of the we should close the file

file.close() // closes the file

CODE:

#include <iostream>
#include <fstream>
#include <stdio.h>

using namespace std;

void readFileCalTotalAvg()
{
  int data[1000], num = 0;
  double total = 0.0, avg;
  // ifstream for reading file
  ifstream file;
  // open method to open file
  file.open("MidtermExam.txt");
  // loop conftinues till it reaches the end of the file
  if (!file.is_open())
  {
    cout << "File cannot be accesed!" << endl;
  }
  else
  {
    while (!file.eof())
    {
      // data from file copies to data[num]
      file >> data[num];
      // stores num of integers in file
      num++;
    }
    // this is because there's an extra line in the text file
    num--;
    // closing a file
    file.close();

    // printing the data stored from file in data array
    //for (int i = 0; i < num; i++)
    //  cout << data[i] << endl;

    // iterarting over each integer and add to total
    for (int i = 0; i < num; i++)
      total += data[i];

    // display the total of all integers in the file
    cout << "Total of all the marks: " << total << endl;
    // calculates the average of all integers
    avg = total / num;
    // displays the average of all the integres
    cout << "Average marks: ";
    // printing only 2 digits after decimal point
    printf("%.2f\n", avg);
  }
}

int main()
{
  // calls the function which read the file and calculates the total and average
  readFileCalTotalAvg();
  return 0;
}

OUTPUT:

When Data is in horizontal

When data is in vertical order

When file cannot be accesed

Hope this helps and clear.

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Thank you!