Answer to Question #346426 in C++ for Nia

Question

Your boss sent you a notepad file called numbers.txt containing an

unknown number of integers. He requests you to write a single program

that a) reads these numbers into an array b) checks whether the file

has correctly opened c) prints out the average of all the numbers in the

array d) then program should search the array to see whether integer 150

is present e) finally the program should print out all the positive numbers

in the array. [20]

Answer 1

#include <iostream>
#include <string>
#include <fstream>
#include <iostream>
#include <vector>


using namespace std;

int main() {
    string filename = "numbers.txt";
    ifstream File;
    int number = 0, element = 0, sum_all = 0;
    bool exists_value = false;
    vector<int>p_darr;
    File.open(filename);


    if (File.is_open()) {
        while (!File.eof()) {
            File >> element;
            number++;
            p_darr.push_back(element);
            sum_all += element;
            if (element == 150) {
                exists_value = true;
            }
        }


        File.close();
    }

    cout << "the average of all the numbers in the array: " << sum_all << endl;
    cout << "Is 150 present in array: " << exists_value << endl;


    for (int i = 0; i < number; i++) {
        if (p_darr[i] > 0) {
            cout << p_darr[i] << " ";
        }
    }
}