Question

Use C++

Read numbers from a file and find the sum of numbers.

Perform the following operations

• Read the console input and create a file.txt.
• $ in the console input is considered as an end of content for a file.
• Close the file after creation.
• Open the file in a read mode and read the numbers from a file and print the sum of all numbers.

Input

77

124

2333

$

    

    Where

• $ indicate an end of console input for a file.

Output

2534

Answer 1

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

using namespace std;

int main() {

  // create file stream object
  fstream f;
  int num;
  int sum = 0, x = 0;

  // open file to write the data
  f.open("file.txt", ios::out);

  // read numbers and write to file
  cin >> num;
  while (num) {
    f << num << endl;
    cin >> num;
  }

  // close file
  f.close();
  
  // open file in read mode
  f.open("file.txt", ios::in);

  // summing numbers from file
  while(f >> x) {
    sum = sum + x;
  }

  // close file
  f.close();

  // display sum
  cout << "\nSum: " << sum;
  return 0;
}

file:

output:

For help please comment.
Thank You.