>>178 public class Kadai { public static void main(String[] args) { // 1 int s1 = 0; for (int i = 1; i <= 10; i++) s1 += i; System.out.println(s1); // 2 int s2 = 0; for (int i = 10; i <= 75; i++) if (i % 2 == 0) s2 += i; System.out.println(s2); // 3 char[] c = {'■', '□'}; int n = 5; int k = 0; for (int i = 0; i < n; i++) { int l = 1 - k; for (int j = 0; j < n; j++) { System.out.print(c[l]); l = 1 - l; } System.out.println(); k = 1 - k; } } }
