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authorRossTheRoss <mstrapp@protonmail.com>2020-01-30 16:55:04 -0600
committerRossTheRoss <mstrapp@protonmail.com>2020-01-30 16:55:04 -0600
commit175721a63b426355274fa9e8063f762020ab8362 (patch)
treecf2c1b33233d660c9f50de5e659b9343bb264984 /csci1913/Java/lab5_strap012.java
parentMake Python thing in Python (diff)
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-//
-// SIEVE. The Sieve of Eratosthenes.
-//
-// James B. Moen
-// 08 Oct 19
-//
-// Test the SIEVE class, for 30 points total.
-//
-
-//
-// Put your code for the class SIEVE here!!!
-//
-class Sieve {
- private boolean[] numbers;
- private int realMax;
- public Sieve(int max){
- if (max<2)
- throw new IllegalArgumentException();
- numbers = new boolean[max];
- realMax = (max - 1);
- for (int i=2; i<max; i+=1) { numbers[i]=true; }
- }
- public void findPrimes() {
- for (int i=2; i<=realMax; i+=1) {
- //Only look for composite numbers if the number is prime
- if (numbers[i]) {
- for (int j=(i*2); j<=realMax; j+=i) {
- numbers[j]=false;
- }
- }
- // System.out.println(i);
- }
- }
- public String toString(){
- String str = "";
- for (int n = 0; n <= realMax; n += 1) {
- if (numbers[n]) {
- str += n; str += " ";
- }
- }
- return str;
- }
-}
-// TOSS THE KNEES. Run SIEVE on some examples.
-
-class TossTheKnees
-{
-
-// MAIN. Find some primes.
-
- public static void main(String [] args)
- {
- Sieve sieve = null; // We must initialize SIEVE or Java will cry.
-
-// 5 points. This must print "Sieve size must be at least 2." but without the
-// quotes.
-
- try
- {
- sieve = new Sieve(0);
- }
- catch (IllegalArgumentException oops)
- {
- System.out.println("Sieve size must be at least 2.");
- }
-
-// 5 points. This must print nothing.
-
- try
- {
- sieve = new Sieve(100);
- }
- catch (IllegalArgumentException oops)
- {
- System.out.println("Sieve size must be at least 2.");
- }
-
-// 10 points. This must print integers from 2 to 99, separated by blanks.
-
- System.out.println(sieve);
-
-// 10 points. This must print the prime numbers between 2 and 99, separated by
-// blanks. 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
-
- sieve.findPrimes();
- System.out.println(sieve);
- }
-}