/** * Main method. * * @param args the command line arguments */ public static void main(String[] args) { SimpleReader in = new SimpleReader1L(); SimpleWriter out = new SimpleWriter1L(); // Sanity check of randomNumber method -- just so everyone can see how // it might be "tested" final int testValue = 17; final int testSamples = 100000; NaturalNumber test = new NaturalNumber2(testValue); int[] count = new int[testValue + 1]; for (int i = 0; i < count.length; i++) { count[i] = 0; } for (int i = 0; i < testSamples; i++) { NaturalNumber rn = randomNumber(test); assert rn.compareTo(test) <= 0 : "Help!"; count[rn.toInt()]++; } for (int i = 0; i < count.length; i++) { out.println("count[" + i + "] = " + count[i]); } out.println(" expected value = " + (double) testSamples / (double) (testValue + 1)); // Check user-supplied numbers for primality, and if a number is not // prime, find the next likely prime after it while (true) { out.print("n = "); NaturalNumber n = new NaturalNumber2(in.nextLine()); if (n.compareTo(new NaturalNumber2(2)) < 0) { out.println("Bye!"); break; } else { if (isPrime1(n)) { out.println(n + " is probably a prime number" + " according to isPrime1."); } else { out.println(n + " is a composite number" + " according to isPrime1."); } if (isPrime2(n)) { out.println(n + " is probably a prime number" + " according to isPrime2."); } else { out.println(n + " is a composite number" + " according to isPrime2."); generateNextLikelyPrime(n); out.println(" next likely prime is " + n); } } } // Close input and output streams in.close(); out.close(); }
/** * Main method. * * @param args the command line arguments */ public static void main(String[] args) { SimpleReader in = new SimpleReader1L(); SimpleWriter out = new SimpleWriter1L(); // Asks the user if they would like to find the square root of a number out.println( "Would you like to find the square root of a number? " + "(Enter 'y' for yes and anything else to terminate)"); String response = in.nextLine(); // Asks for number to find square root of. Will continue to ask user if // they would like to find the square root after computation. while (response.equals("y")) { out.println("Enter number: "); double x = in.nextDouble(); out.println("Enter error percentage margin: "); double e = in.nextDouble(); double sqroot = sqrt(x, e); out.println("Square Root estimate: " + sqroot); // Asks the user if they would like to find the square root out.println( "Would you like to find the square root of a number? " + "(Enter 'y' for yes and anything else to terminate)"); response = in.nextLine(); } if (response != "y") { out.println("Terminating Program"); } /* * Close input and output streams */ in.close(); out.close(); }