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lab/lab2/Question1/SumAndAverage.java

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+/*
+ * Author: CHEN Yongyuan (Walter) 1930006025 from OOP(1007)
+ * Date: 2022-03-02
+ * Assignment: #1 Question 1
+ * Description: This program is used to calculate the sum and average of the numbers.
+ * Input: The numbers
+ * Output: The sum and average of the numbers
+ * Version: 1.0
+ */
+public class SumAndAverage {
+    public static void main(String[] args) {
+        int sum = 0; // Store the accumulated sum init to 0
+        double average; // average in double
+        int lowerbound = 1; // The lowerbound to sum
+        int upperbound = 100; // The upperbound to sum
+
+        // Use a for-loop to sum from lowerbound to upperbound
+        for (int number = lowerbound; number <= upperbound; number++) {
+            // add only odds number
+            if (number % 2 != 0) {
+                sum += number;
+            }
+        }
+
+        // Compute average in double. Beware that int/int produces int.
+        average = (double) sum / (upperbound - lowerbound + 1);
+
+        // Print sum and average
+        System.out.println("The sum is " + sum);
+        System.out.println("The average is " + average);
+
+        // 6.1 while loop
+        System.out.println("---- While-loop:");
+        sum = 0;
+        int number = lowerbound;
+        while (number <= upperbound) {
+            // only add number that is divisible by 7
+            if (number % 7 == 0) {
+                sum += number;
+            }
+            number++;
+        }
+
+        // Compute average in double. Beware that int/int produces int.
+        average = (double) sum / (upperbound - lowerbound + 1);
+
+        // Print sum and average
+        System.out.println("The sum is " + sum);
+        System.out.println("The average is " + average);
+
+        // 6.2 do-while
+        System.out.println("---- Do-while:");
+        sum = 0; // Reset sum
+        number = lowerbound;
+        do {
+            // sum of squares of number
+            sum += number * number;
+            number++;
+        } while (number <= upperbound);
+
+        // Compute average in double. Beware that int/int produces int.
+        average = (double) sum / (upperbound - lowerbound + 1);
+
+        // Print sum and average
+        System.out.println("The sum is " + sum);
+        System.out.println("The average is " + average);
+
+    }
+}