Answer to Question #244819 in C++ for vishal

Question

Write a C++ program to sum the values in the file with respect to the input of the user. The file contains a set of numerical inputs. Read all the inputs from the file and calculate the sum of odd and even numbers based on the choice of the user.

Sample Format of the file.txt file,

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Constraints:

Find the sum of odd numbers if the choice is 1.

Find the sum of even numbers if the choice is 2.

Get the choice from the console and display the output in the console.

Input Format:

Read an integer(choice) as an input from the console. 

To sum value from the file, read the content as input from the file (file.txt)

Sample Input and Output 1 :

Enter the choice

1.Odd

2.Even

1

The total of all numbers is 64

Answer 1

#include <iostream>
#include <fstream>
#include <vector>
using namespace std;

int main() {
    ifstream fin("file.txt");
    vector<int> v;
    int x;

    while (fin) {
        fin >> x;
        cout << "x = " << x << endl;
        v.push_back(x);
    }
    fin.close();

    cout << "Enter the choice" << endl;
    cout << "1.Odd" << endl;
    cout << "2.Even" << endl;
    int choice;
    cin >> choice;

    int sum=0;
    if (choice == 1) {
        for (size_t i=0; i<v.size(); i+=2)
            sum += v[i];
    }
    if (choice == 2) {
        for (size_t i=1; i<v.size(); i+=2)
            sum += v[i];
    }

    cout << "The total of all number is " << sum << endl;

    return 0;
}