Find two distinct prime numbers with given product in C++

In this tutorial, we will be discussing a program to find two distinct prime numbers with given product.

For this we will be provided with an integer value. Our task is to find the two prime integer values such that their product is equal to the given value.

Example

 Live Demo

#include <bits/stdc++.h>
using namespace std;
//generating prime numbers less than N.
void findingPrimeNumbers(int n, bool calcPrime[]) {
   calcPrime[0] = calcPrime[1] = false;
   for (int i = 2; i <= n; i++)
      calcPrime[i] = true;
   for (int p = 2; p * p <= n; p++) {
      if (calcPrime[p] == true) {
         for (int i = p * 2; i <= n; i += p)
            calcPrime[i] = false;
      }
   }
}
//printing the valid prime pair
void calcPairPrime(int n) {
   int flag = 0;
   bool calcPrime[n + 1];
   findingPrimeNumbers(n, calcPrime);
   for (int i = 2; i < n; i++) {
      int x = n / i;
      if (calcPrime[i] && calcPrime[x] and x != i and x * i == n) {
         cout << i << " " << x;
         flag = 1;
         return;
      }
   }
   if (!flag)
      cout << "No prime pair exist";
}
int main() {
   int n = 24;
   calcPairPrime(n);
   return 0;
}

Output

No prime pair exist

Ayush Gupta

Updated on 19-Aug-2020 10:34:42

• Related Questions & Answers
• Find two distinct prime numbers with given product in C++ Program
• Find the Product of first N Prime Numbers in C++
• Find product of prime numbers between 1 to n in C++
• Program to find the largest product of two distinct elements in Python
• Program to find Prime Numbers Between given Interval in C++
• Find two numbers with sum and product both same as N in C++
• Absolute Difference between the Product of Non-Prime numbers and Prime numbers of an Array?
• Find two numbers with sum and product both same as N in C++ Program
• Python - Find the number of prime numbers within a given range of numbers
• Product of all prime numbers in an Array in C++
• Python Program to print all distinct uncommon digits present in two given numbers
• Program to find maximum product of two distinct elements from an array in Python
• Finding two prime numbers with a specific number gap in JavaScript
• C++ program to find two numbers with sum and product both same as N
• Write a Golang program to find prime numbers in a given range