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lab/lab2/Question2/TimeTable.java

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+/*
+ * Authro: CHEN Yongyuan (Walter) 1930006025 from OOP(1007)
+ * Date: 2022-03-02
+ * Description: A table of multiplication table of 1 to 9.
+ *     Using nested for loop to print the table.
+ * Assignemnt: #2 Question2
+ * Output:
+
+* |   1   2   3   4   5   6   7   8   9
+---------------------------------------
+1 |   1   2   3   4   5   6   7   8   9
+2 |   2   4   6   8  10  12  14  16  18
+3 |   3   6   9  12  15  18  21  24  27
+4 |   4   8  12  16  20  24  28  32  36
+5 |   5  10  15  20  25  30  35  40  45
+6 |   6  12  18  24  30  36  42  48  54
+7 |   7  14  21  28  35  42  49  56  63
+8 |   8  16  24  32  40  48  56  64  72
+9 |   9  18  27  36  45  54  63  72  81
+
+ */
+
+public class TimeTable {
+    public static void printHeader() {
+        System.out.println("* |   1   2   3   4   5   6   7   8   9");
+        System.out.println("---------------------------------------");
+    }
+    public static void printLineBegin(int i) {
+        System.out.print(i + " |");
+    }
+    public static int spaceBefore(int i) {
+        // format the number to be printed
+        String s = Integer.toString(i);
+        // calculate the number of spaces before the number
+        int len = s.length();
+        // return the number of spaces
+        int space = 4 - len;
+        return space;
+    }
+    public static void main(String[] args) {
+        // print the two lines header
+        printHeader();
+
+        // loop for main content
+        for (int i = 1; i <= 9; i++) {
+
+            printLineBegin(i);
+
+            // loop for each number in the line
+            for (int j = 1; j <= 9; j++) {
+                int number = i * j;
+
+                // print the space before the number
+                for (int k = 0; k < spaceBefore(number); k++) {
+                    System.out.print(" ");
+                }
+
+                // print the number
+                System.out.print(number);
+            }
+            // print the end of the line
+            System.out.println();
+        }
+    }
+}