Create 1b. Calculator

Week 3: Objects, files and exceptions/1b. Calculator

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+Write the method
+
+int calculate(int num1, int num2, String operator)
+
+...which takes as parameters two integers and a string. 
+The string has 4 possible values: "+", "-", "*" or "/"
+The method calculates and returns the operator-defined arithmetic operation on the numbers.
+
+
+Examples on method calls:
+public static void main(String[] parameters){
+    System.out.println(calculate(4, 5, "+"));
+    System.out.println(calculate(8, 2, "-"));
+    System.out.println(calculate(3, 4, "*"));
+    System.out.println(calculate(10, 2, "/"));
+}
+
+
+Program outputs:
+9
+6
+12
+5
+
+
+
+
+
+
+
+import java.util.Random;
+
+public class Test{
+    public static void main(String[] args){
+        final Random r = new Random();
+        
+        
+        Object[][] p = {{1,4,"+"}, {121,145,"-"}, {5,8,"*"}, {9,3,"/"}, {99,77,"-"}, 
+            {2,4,"*"}, {20,5,"/"}, {1,2,"-"}, {9,3,"*"}};
+        for (Object[] pa : p) {
+            System.out.print("Testing with parameters ");
+            System.out.println(pa[0] + ", " + pa[1] + ", " + pa[2]);
+            int tulos = calculate((Integer) pa[0], (Integer) pa[1], (String) pa[2]);
+            System.out.println("Result: " + tulos);
+            System.out.println("");
+        }
+    }
+
+
+    public static int calculate(int num1, int num2, String operator) {
+        int result;
+        if (operator.equals("+")) {
+            result = num1 + num2;
+        } 
+        else if (operator.equals("-")) {
+            result = num1 - num2;
+        } 
+        else if (operator.equals("*")) {
+            result = num1 * num2;
+        } 
+        else if (operator.equals("/")) {
+            result = num1 / num2;
+        } 
+        else {
+            result = 0;
+        }
+        return result;
+    }
+
+
+
+
+
+    
+}
+
+
+
+
+
+
+
+Testing with parameters 1, 4, +
+Result: 5
+
+Testing with parameters 121, 145, -
+Result: -24
+
+Testing with parameters 5, 8, *
+Result: 40
+
+Testing with parameters 9, 3, /
+Result: 3
+
+Testing with parameters 99, 77, -
+Result: 22
+
+Testing with parameters 2, 4, *
+Result: 8
+
+Testing with parameters 20, 5, /
+Result: 4
+
+Testing with parameters 1, 2, -
+Result: -1
+
+Testing with parameters 9, 3, *
+Result: 27
+
+
+