Lucas-import java.util.*; class Main { public static void main(String[] args) { int i, j; int sum_row, sum_col, sum_diagonal = 0, sum = 0; boolean thing=true; int[][] magic square = new int[4][4]; Scanner in = new Scanner(System.in); System.out.println("Please enter the numbers in your square with spaces and in the shape of a 4x4 square(with all numbers once from 1-16)."); for (i=0; i<4; i++) for (j=0; j<4; j++) magic square[i][j] = in.nextInt(); for (i=0; i<4; i++) { for (j=0; j<4; j++) System.out.print(magic square[i][j] + " "); System.out.println(); } for (j=0; j<4; j++) sum += magic square[0][j]; for (i=1; i<4; i++) { sum_row = 0; for (j=0; j<4; j++) sum_row += magic square[i][j]; if (sum_row != sum) { thing = false; break; } } if (thing) { for (j=0; j<4; j++) { sum_col = 0; for (i=0; i<4; i++) sum_col += magic square[i][j]; if (sum_col != sum) { thing = false; break; } } } if (thing) { for (i=0; i<4; i++) for (j=0; j<4; j++) if (i==j) sum_diagonal += magic square[i][j]; if (sum_diagonal != sum) { thing = false; } } if (thing) { sum_diagonal = 0; for (i=0; i<4; i++) for (j=0; j<4; j++) if ((i+j) == 2) sum_diagonal += magic square[i][j]; if (sum_diagonal != sum) { thing = false; } } if (thing) System.out.println("It's a magic square."); else System.out.println("It's a non-magic square."); } }

class Main { public static void main(String[] args) { int N = 4; int M = 3; int A = 3; int B = 2; int count = 0; int[][] NxM = { { 1, 2, 3 }, { 4, 5, 6 }, { 7, 8, 9 }, { 10, 11, 12 } }; for (int y = 0; y < A; y++) { for (int x = 0; x < B; x++) { count = count + NxM[y][x]; } } for (int y = 0; y < A; y++) { for (int x = 1; x <= B; x++) { count = count + NxM[y][x]; } } for (int y = 1; y <= A; y++) { for (int x = 0; x < B; x++) { count = count + NxM[y][x]; } } for (int y = 1; y <= A; y++) { for (int x = 1; x <= B; x++) { count = count + NxM[y][x]; } } System.out.println("Da total is " + count + "."); } }

public class Main { private int shift; public Main(int shift) { this.shift = shift; } public static void main(String[] args) { OtherCaesarCipher app = new OtherCaesarCipher(-3); String input = "ATTACK"; String Caesar = app.encode(input); System.out.println(input + "=" + Caesar); System.out.println("&"); System.out.println(Caesar + "=" + input); } public String thing(String text, int shift) { char[] a = new char[text.length()]; for (int i = 0; i < a.length; i++) { int difference = text.charAt(i) - 'A' + shift; if (difference < 0) difference += 26; if (difference >= 26) difference %= 26; a[i] = (char) ('A' + difference); } return String.valueOf(a); } public String encode(String text) { return thing(text, shift); } public String decode(String cipher) { return thing(cipher, -shift); } }

Lucas Liu's HW class Main { public static StringBuffer encrypt(String text, int s) { StringBuffer result = new StringBuffer(); for (int i = 0; i < text.length(); i++) { if (Character.isUpperCase(text.charAt(i))) { char ch = (char) (((int) text.charAt(i) + s - 65) % 26 + 65); result.append(ch); } else { char ch = (char) (((int) text.charAt(i) + s - 97) % 26 + 97); result.append(ch); } } return result; } public static void main(String[] args) { String text = "Attack!"; System.out.println("Enter your shift:"); int s = 3; System.out.println("Text : " + text); System.out.println("Shift : " + s); System.out.println("Cipher: " + encrypt(text, s)); } }