Write a program that takes a number (N) as input and if it is a prime number, calculate the summation for the following series.

 

Problem: Write a program that takes a number (N) as input and if it is a prime number, calculate the summation for the following series.

#include<iostream>

using namespace std;

int main()

{

   int n;

   int sum=0;

   cout<<" "<<"Enter any positive number:"<<" ";

   cin>>n;

   for(int i=2;i<3;i++)

   {

      if(n==0 || n==1)

      {

          cout<<"Error!try another number."<<endl;

          cout<<"Prime number is start from 2."<<endl;

      }

       else if(n%2!=0)

       {

           cout<<" "<<n<<" "<<"is a prime number."<<endl;

       }

 else{

         cout<<" "<<n<<" "<<"is not a prime number."<<endl;

         break;

       }

         for(int i=2;i<=n;i++)

         {

             cout<<" "<<"The random number till"<<" "<<n<<" "<<"is:"<<" "<<i<<endl;

             sum+=i;

         }

         cout<<endl;

         cout<<" "<<"The sum of this random number:"<<" "<<sum<<endl;

   }

}

Output :