What is a way to print all prime numbers between 1 to 100?

Answer 1

The simplest thing is to use the Sieve of Eratosthenes: make an array using the positive integers as the index up to 100.

Starting with 2, store 2 in your list of primes, and and then delete the variable for each multiple of 2 (4, 6, 8, etc.) Then find the smallest index that still exists (3); add 3 to your list of primes, and delete the variable for each multiple of 3 (6, 9, 12, etc.). Then find the next smallest index that still exists (5) and repeat the process over and over. When you reach 100, you're done. (There are many optimizations for this)

Answer 2

Here they are: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97