Add files via upload

Author: M-F-Tushar

OOP in Java/Chapter 10 - Object-Oriented Thinking/Code_Example/Exercise10_26.java

@@ -0,0 +1,51 @@
+package ch_10;
+
+/**
+ * 10.26 (Calculator) Revise Listing 7.9, Calculator.java, to accept an expression as
+ * a string in which the operands and operator are separated by zero or more
+ * spaces. For example, 3+4 and 3 + 4 are acceptable expressions.
+ */
+public class Exercise10_26 {
+    public static void main(String[] args) {
+
+        StringBuilder str = new StringBuilder();
+
+        for (String arg : args) {
+            str.append(arg);
+        }
+
+        String str2 = str.toString().replaceAll(" ", "");
+
+        str2 = str2.replaceAll("[+]", "%+%");
+        str2 = str2.replaceAll("[-]", "%-%");
+        str2 = str2.replaceAll("[.]", "%.%");
+        str2 = str2.replaceAll("[/]", "%/%");
+
+
+        args = str2.split("%");
+
+        int result = 0;
+
+        switch (args[1].charAt(0)) {
+
+            case '+':
+                result = Integer.parseInt(args[0]) + Integer.parseInt(args[2]);
+                break;
+
+            case '-':
+                result = Integer.parseInt(args[0]) - Integer.parseInt(args[2]);
+                break;
+
+            case '.':
+                result = Integer.parseInt(args[0]) * Integer.parseInt(args[2]);
+                break;
+
+            case '/':
+                result = Integer.parseInt(args[0]) / Integer.parseInt(args[2]);
+                break;
+
+        }
+        System.out.println(args[0] + ' ' + args[1] + ' ' + args[2] + " = " + result);
+    }
+
+}