java考试题 很简单

Question

写一个java的程序,计算一个小于50的平方根,当任意一个数小于0或者大于等于50的时候，抛出自己的异常

Answer 1

1. public class B { public static void main(String[] args) { int part = 12; int result = 0; for(int i = 0; i < 50; i ++) { part = part + 20; if(i % 2 == 0) { result += part; } else { result -= part; } } System.out.print(result); //-20 * 25 = -500 }} 2. public class B { public static void main(String[] args) { int [] a = {4, 5, 9, 2, 8, 1}; int [] b = parity(a); for(int i = 0; i < 6; i ++) { if(a[i] % 2 == 0) { b[i] = 0; } else { b[i] = 1; } System.out.print(b[i] + ","); } } public static int[] parity(int[] a) { int [] b = new int[a.length]; for(int i = 0; i a.length; i ++) { if(a[i] % 2 == 0) { b[i] = 0; } else { b[i] = 1; } } return b; }} 3. public class B { public static void main(String[] args) { int a = 49716; System.out.print(invert(a)); } public static int invert(int n) { int result = 0; while(n > 0) { result = result * 10 + n % 10; n = n / 10; } return result; }} 4. 我要去上课了，如果来得及，我晚上给你再写..

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