Prime Numbers 1 to 100: There are a total of 25 prime numbers between 1 and 100.
Every composite number can be expressed as a product of prime numbers, and this factorization is unique up to the order of the factors. Two prime numbers are always relatively prime to each other (i.e., they have no common factors other than 1). All prime numbers, except for 2, are odd, meaning that 2 is the only even prime number. Every even positive integer greater than 2 can be represented as the sum of two prime numbers. For any number greater than 1, there exists at least one prime number that divides it. They are used in encryption algorithms to secure communication, and they are also used in various algorithms in computer science and other fields. Prime numbers play an important role in mathematics, especially in number theory and cryptography. Trick to find prime numbers between 1 to 100. Method to Check a Number is Prime or not?. 
both inner and outer loops are checking only within possible limits.
the even numbers are not checked even once throughout the process. Why this code performs better than already accepted ones: Checkout the results for different N values in the end. My code takes significantly lesser iteration to finish the job. Using Sieve of Eratosthenes logic, I am able to achieve the same results with much faster speed.
How would I need to change this code to the way my book wants it to be? int main () So I did try changing my 2nd loop to for (int j=2 jc++ code prints out the following prime numbers: 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97.īut I don't think that's the way my book wants it to be written.
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