Question

Please explain this C++ below on how to get the following outputs (see code)

#include <iostream>

using namespace std;

// Tests for algorithm correctness
// -------------------------------
// 1 gives output "1 3   7 15 31 63 127 255 511 1023 2047"
// 2 gives output "2 5 11 23 47 95 191 383 767 1535 3071"
// 3 gives output "3 7 15 31 63 127 255 511 1023 2047 4095"
// 5 gives output "5 11 23 47 95 191 383 767 1535 3071 6143"

// Global variables
int X;
int I;

int main()
{
    cout << "Enter starting value: ";
    cin >> X;

    cout << X;
    cout << " ";

    for (I = 1; I <= 10; ++I)
    {
        if ((X & 1) == 0)
        {
            X = X + 3;
        }
        else
        {
            X = (2 * X) + 1;
        }
        cout << X << " ";
    }
    cout << endl

Answer 1

input code:

output:

code:

#include <iostream>
using namespace std;
/*declare the global variable*/
int X;
int I;

int main()
{
/*take user input*/
cout << "Enter starting value: ";
cin >> X;
  
/*print first number*/
cout << X;
cout << " ";
/*take for loop for print 10 number of series*/
for (I = 1; I <= 10; ++I)
{
/*every number is ith time than last number + 1 */
/*for ex if input is 1 than first is 1 and second is 2*1+1=3
third 3*2+1=7*/
X = (2 * X) + 1;
/*print number*/
cout << X << " ";
}
cout << endl;
}