java 程式問題 急!!!!!!!!!!!!!!!

Question

1. 印出

1

2 3 4

5 6 7 8 9

........................

............................

............................

印到第十列

2.印出2001年~2100年 的所有leap year ( ten per line)

Answer 1

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請參考我的做法

public class Y0945 {

public static void main(String[] args) {

// Q1

int counter = 0;

int flag = 1;

while (counter++ < 100) {

System.out.print(counter + " ");

if (flag * flag == counter) {

flag++;

System.out.println();

}

}

// Q2

counter = 0;

for (int i = 2001; i <= 2100; i++) {

if (i % 4 == 0) {

System.out.print(i + " ");

counter++;

}

if (counter == 10) {

counter = 0;

System.out.println();

}

}

}

}

2009-10-16 14:41:58 補充：

1

234

56789

...................

............................

左右要留空白

Q1 請改成

2009-10-16 14:42:09 補充：

int counter = 0;

int flag = 1;

final int total = 100;

int col_count = 0;

int cols = (int)(Math.sqrt(total));

while (counter++ < total) {

if (Math.abs(cols - flag - col_count) > 0) {

System.out.print(" ");

col_count++;

counter--;

continue;

}

2009-10-16 14:42:13 補充：

System.out.print(counter + " ");

if (flag * flag == counter) {

flag++;

col_count = 0;

System.out.println();

}

}

Answer 2

public class Test {

　//問題1

　private static void printNum(int size) {

　　for (int i = 1; i <= size; i ++) {

　　　for (int j = (i - 1) * (i - 1) + 1, k = 0; k < 2 * i - 1; j++, k++) {

　　　　System.out.print(j + " ");

　　　}

　　　System.out.println();

　　}

　}

　//問題2

　private static void printLeapYear(int y_s, int y_e) {

　　for (int i = y_s, cnt = 1; i <= y_e; i++) {

　　　if (isLeapYear(i)) {

　　　　System.out.print(i + (cnt++%10==0?"\n":" "));

　　　}

　　}

　}

　private static boolean isLeapYear(int yyyy) {

　　return ((yyyy % 400 == 0) || ((yyyy % 4 == 0) && (yyyy % 100 != 0)));

　}

　public static void main(String[] arg) {

　　printNum(10);

System.out.println();

printLeapYear(2001, 2100);

　}

}