Thread: Prime number program

Been a long time since I posted a problem aye! Still remember ol Prelude helping me with that termination prevention thingy.
So, to the point. I'm making a prime numbers program and in two cases I do the following -:
2. Enter a limit upto which primes will be displayed and summed.
3. Enter 'n' for which n primes will be displayed and summed.
I do get the display but not the sum. Can't seem to figure out whats wrong.
Here's case 2-:

Code:

 case 2:
                       cout << "\nEnter any limit";
                       cin >> l; //The limit
                       for(num = 2; num <= l; num++) //num begins at 2 and keeps incrementing till l
                       {
                               flag = 1; //flag variable
                               for(i = 2; i <= num/2; i++)
                               {
                                     if (num % i == 0)
                                     flag = 0;
                                     break;
                               }
                               if(flag == 1)
                               cout << num << "\t";
                               sum = sum + num;
                       }
                             
                               cout << "The sum is -> " << sum;
                               getch();
                               break;

And case 3-:

Code:

case 3:
                       cout << "\nEnter the number of terms - ";
                       cin >> n;
                       ctr = 0; //counter variable
                       for(num = 2; ctr < n; num++)
                       {
                               flag = 1;
                               for(i = 2; i <= num/2; i++)
                               {
                                     if(num % i == 0)
                                     flag = 0;
                                     break;
                               }
                               if(flag == 1)
                               cout << num << "\t";
                               sum += num;
                               ctr++;
                       }
                               cout << "The sum is -> " << sum;
                               getch();
                               break;

And the variables have been declared before hand.