Question

cout<<"blah<<endl; no std:cout

C++ pointers

Generate 25 integer random numbers between 0-100 and place them in a file, each number on a single line.. Dont forget to close the file once the numbers are generated. Then read the file and create a dynamic array that holds these numbers. The size of the array is the numbers read.

Answer 1

#include <iostream>
#include <fstream>
#include <cstdlib>
#include <ctime>

using namespace std;

int main() {
    srand(time(NULL));

    int size = 25;

    // store numbers in file
    ofstream out("random_numbers.txt");
    for (int i = 0; i < size; ++i) {
        out << rand() % 101 << endl;
    }
    out.close();

    ifstream in("random_numbers.txt");
    int *arr = new int[size];
    for (int i = 0; i < size; ++i) {
        in >> arr[i];
    }
    in.close();

    // display numbers
    for (int i = 0; i < size; ++i) {
        cout << arr[i] << endl;
    }

    delete[] arr;
    return 0;
}