C++ program to print even numbers in a range using class

Given a range, we have to print all even numbers in that range using the class and object approach.
Submitted by Shubh Pachori, on August 14, 2022

Example:

Input:
Enter Range: 2 9

Output: 
Even Numbers in the range 2 to 9 are 
2 4 6 8

C++ code to print even numbers in a range using class and object approach

#include <iostream>
using namespace std;

// create a class
class IsEven {
  // declare private data members
 private:
  int start, end;

  // public functions
 public:
  // getRange() function to insert range
  void getRange() {
    cout << "Enter Range: ";
    cin >> start >> end;
  }

  // isEven() function to print even numbers in between
  // range
  void isEven() {
    // initilaize int type variable for indexing
    int index_1;

    cout << "Even Numbers in the range " << start << " to "
         << end << " are " << endl;

    // for loop to search even number in the range
    for (index_1 = start; index_1 <= end; index_1++) {
      // if the index_1 is completely divided by 2
      if (index_1 % 2 == 0) {
        cout << index_1 << " ";
      }
    }
  }
};

int main() {
  // create a object
  IsEven E;

  // calling getRange() function to insert range
  E.getRange();

  // isEven() function search even numbers in the range
  E.isEven();

  return 0;
}

Output:

RUN 1:
Enter Range: 1 100
Even Numbers in the range 1 to 100 are 
2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 
38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 
70 72 74 76 78 80 82 84 86 88 90 92 94 96 98 100

RUN 2:
Enter Range: 11 21
Even Numbers in the range 11 to 21 are 
12 14 16 18 20

Explanation:

In the above code, we have created a class IsEven, two int type data members start and end to store the start and end of the range, and public member functions getRange() and isEven() to store and print even numbers in between that given range.

In the main() function, we are creating an object E of class IsEven, reading a range by the user using getRange() function, and finally calling the isEven() member function to print the even numbers in the given range. The isEven() function contains the logic to print even numbers in the given range and printing the result.