Question

User enters two numbers, N1, and N2.
Write a program that determine if the numbers are twin primes.

Definition: Twin primes are two prime numbers separated by 2. For example, 3 and 5 are both prime numbers and separated by 2. Another example is 17, 19.

Answer 1

#include<iostream>
using namespace std;

//FUNCTION TO CHECK WHETHER NUMBER IS PRIME OR NOT
int isPrime(int n)
{
        int i;
        int flag = 0;
        for(i = 2; i < n; i++)
        {
                if(n % i == 0)
                {
                        flag = 1;
                        break;
                }
        }

        if(flag == 1)
                return 0;
        else
                return 1;
}

int main()
{
        int n1, n2;

        //TAKING INPUT FROM USER
        cout<<"Enter two numbers \n";
        cin>>n1>>n2;

        //IF BOTH NUMBERS ARE PRIME
        if(isPrime(n1) == 1 && isPrime(n2) == 1)
        {

                //IF THE DIFFERENCE BETWEEN NUMBERS IS 2
                if((n1 - n2) == 2 || (n1 - n2) == -2)
                        cout<<"\nThe entered numbers are twin primes\n";

                //IF THE DIFFERENCE BETWEEN NUMBERS IS NOT 2
                else
                        cout<<"\nThe entered numbers are not twin primes\n";
        }

        //IF BOTH NUMBERS OR ONE OF THEM IS NOT PRIME
        else
        {
                cout<<"\nThe entered numbers are not twin primes\n";
        }
}

YOU HAVE NOT SPECIFIED THE PROGRAMMING LANGUAGE THAT'S WHY I HAVE DONE IT IN C++.

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