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C++ program to find the product of prime numbers in a range using class

Submitted by Shubh Pachori, on September 01, 2022

Problem statement

Given a range, we have to find the product of prime numbers in that range using the class and object approach.

Example:

Input: 
Enter Range: 1 9

Output: 
Prime Numbers in the range 1 to 9 are 1 2 3 5 7 
Product of prime numbers in range is 210

C++ code to find the product of prime numbers in a range using the class and object approach

#include <iostream>
using namespace std;

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

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

  // productPrime() function to print the product 
  // of prime numbers in between range
  int productPrime() {
    // initilaize int type variables 
    // to perform operations
    int index_1, index_2, product = 1, check = 1;

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

    // for loop to search prime number in the range
    for (index_1 = start; index_1 <= end; index_1++) {
      // counter variable
      int check = 0;

      // for loop for checking if the number is prime or not
      for (index_2 = 2; index_2 < index_1; index_2++) {
        // if condition to check if the index_1 
        // is divisible by the index_2
        if (index_1 % index_2 == 0) {
          // counter increased by 1
          check++;

          // break statement to break the loop
          break;
        }
      }

      // if the counter is zero then the index_1 number
      // is printed and multiplied to the product
      if (check == 0) {
        cout << index_1 << " ";

        // multiplying prime numbers
        product = product * index_1;
      }
    }

    // returning product
    return product;
  }
};

int main() {
  // create an object
  Prime P;

  // int type variable to store product 
  // of prime numbers
  int product;

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

  // productPrime() function to 
  // multiply prime numbers in the range
  product = P.productPrime();

  cout << "\nProduct of prime numbers in range is " << product;

  return 0;
}

Output

RUN 1:
Enter Range: 2 11
Prime Numbers in the range 2 to 11 are 2 3 5 7 11 
Product of prime numbers in range is 2310

RUN 2:
Enter Range: 10 20
Prime Numbers in the range 10 to 20 are 11 13 17 19 
Product of prime numbers in range is 46189

Explanation

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

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

C++ Class and Object Programs (Set 2) »