C++ program to print all Even and Odd numbers from 1 to N

Given a number N, the task is to print N even numbers and N odd numbers from 1.

Examples:

Input: N = 5
Output: 
Even: 2 4 6 8 10
Odd: 1 3 5 7 9

Input: N = 3
Output: 
Even: 2 4 6
Odd: 1 3 5

Approach:

1. For Even numbers:
   • Even number are numbers that are divisible by 2.
   • To print even numbers from 1 to N, traverse each number from 1.
   • Check if these numbers are divisible by 2.
   • If true, print that number.
2. For Odd numbers:
   • Odd number are numbers that are not divisible by 2.
   • To print Odd numbers from 1 to N, traverse each number from 1.
   • Check if these numbers are not divisible by 2.
   • If true, print that number.

Below is the implementation of the above approach:

// C++ program to print all Even
// and Odd numbers from 1 to N

#include <bits/stdc++.h>
using namespace std;

// Function to print even numbers
void printEvenNumbers(int N)
{

    cout << "Even: ";
    for (int i = 1; i <= 2 * N; i++) {

        // Numbers that are divisible by 2
        if (i % 2 == 0)
            cout << i << " ";
    }
}

// Function to print odd numbers
void printOddNumbers(int N)
{

    cout << "\nOdd: ";
    for (int i = 1; i <= 2 * N; i++) {

        // Numbers that are not divisible by 2
        if (i % 2 != 0)
            cout << i << " ";
    }
}

// Driver code
int main()
{

    int N = 5;

    printEvenNumbers(N);
    printOddNumbers(N);

    return 0;
}
Output:

Even: 2 4 6 8 10 
Odd: 1 3 5 7 9