Question

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C++ Prime Numbers program

I am working on a c++ program to calculate all prime numbers between 3 and an integer ‘x’.
When I enter 10 as ‘x’ I am getting the output:
3
5
5
5
7
7
7
7
7
9

Can anyone tell me how to fix this?

#include <iostream>
#include <cmath>

using std::cout;
using std::endl;
using std::cin;

int main(){

   int x;
   int i;
   int j;

   cout << "Please enter an integer 'x' greater than 3: " << endl;

   cin >> x;

   if (x <= 3){

        cout << "Please enter new value 'x' greater than 3: " << endl;

        cin >> x;
   }
        for(int i=3; i<=x; i++){
                for(j=2; j<i; j++){
                   if(i%j == 0)
                        break;
                   else if(i == j+1);
                        cout << i << endl;
                   }
        }
        return 0;
}

Answer 1

Offending line:

else if(i == j+1);

Remove the semi-colon.