Program to print even or odd numbers in a given range using recursion in C++.

Solution:

#include <iostream>

using namespace std;

void calculate(int start, int n)
{
    if(start> n)
        return;
    cout<<start<<"\t";
    calculate(start+2, n);
}
 
int main()
{
    int n;
    cout<<"Enter a number ";
    cin>>n;
    cout<<"Even Numbers are : ";
    calculate(2,n);
    cout<<"\nOdd Numbers are : ";
    calculate(1,n);
    return 0;
}

Output :

Enter a number 20
Even Numbers are : 2    4       6       8       10      12      14      16      18      20
Odd Numbers are : 1     3       5       7       9       11      13      15      17      19