Printing All Primes using C++ image

The primes numbers are the integers with can only be divided by 1 or by itself.  In other words, a prime number has only two factors which are 1 and the number itself.

The following are some examples:

  • 1 : Have only one factor which is 1 itself. Hence, not a prime
  • 2 : Have 1 and 2 are the only factors. Hence, a prime.
  • 3 : Have 1 and 3 are the only factors. Hence, a prime.
  • 4 : Have 1, 2 and 4 are the factors. Hence, not a prime.
  • 5 : Have 1 and 5 are the only factors. Hence, a prime
  • and so on...

In this program, we will print out the prime numbers up to n which is supplied by the user on runtime.

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Be Cool!

If you have any other method in your mind, feel free to share us in the comments below. We will include it with this post along with your credits.

Method 1

Using counting the factors

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