Changes between Version 2 and Version 3 of GnappoProduct

Timestamp:

Jul 27, 2006, 5:35:00 PM (18 years ago)

Author:

gnappo

Comment:

--

GnappoProduct

@@ -2 +2 @@
 #!rst
 public class GnappoProduct {
-        
-        private static class SchemeExpressionPower implements SchemeExpression {
-                private SchemeExpression exp1;
-                private SchemeExpression exp2;
-                public SchemeExpressionPower(SchemeExpression expr1, SchemeExpression expr2) {
-                        exp1=expr1;
-                        exp2=expr2;
-                }
-                public SchemeValue evaluate(SchemeEnvironment env) throws SchemeException {
-                        return SchemeFactoryManager.instance().create("SchemeExpressionInt", 
-                                ((int)(Math.pow(exp1.evaluate(env).asInt(),exp2.evaluate(env).asInt())))).evaluate(env);
-                }
-                public void prettyPrint(PrintStream out) {
-                        out.print("(pow ");
-                        exp1.prettyPrint(out);
-                        out.print(" ");
-                        exp2.prettyPrint(out);
-                        out.print(")");
-                }
-        }
+    /**
+     * @param args
+     * @throws SchemeException
+     */
+    public static void main(String[] args) throws SchemeException {
+        // TODO Auto-generated method stub
+        SchemeFactoryManager fm = SchemeFactoryManager.instance();
 
-        /**
-         * @param args
-         * @throws SchemeException 
-         */
-        public static void main(String[] args) throws SchemeException {
-                // TODO Auto-generated method stub
-                SchemeFactoryManager fm = SchemeFactoryManager.instance();
-                fm.put("pow", new SchemeFactory() {
-                        public SchemeExpression create(Object... args) {
-                                return new SchemeExpressionPower((SchemeExpression)args[0],(SchemeExpression)args[1]);
-                        }
-                });
-                SchemeExpression power = fm.create("pow",fm.create("SchemeExpressionInt",2),fm.create("SchemeExpressionInt",4));
-                power.prettyPrint(System.out);
-                System.out.println();
-                System.out.print(power.evaluate(null));
+        fm.put("pow",
+            new SchemeFactory() {
+                public SchemeExpression create(Object... args) {
+                    return new SchemeExpressionPower((SchemeExpression) args[0],
+                        (SchemeExpression) args[1]);
+                }
+            });
 
-        }
-        
+        SchemeExpression power = fm.create("pow",
+                fm.create("SchemeExpressionInt", 2),
+                fm.create("SchemeExpressionInt", 4));
 
+        power.prettyPrint(System.out);
+        System.out.println();
+        System.out.print(power.evaluate(null));
+    }
 
+    private static class SchemeExpressionPower extends SchemeExpressionAbstract {
+        private SchemeExpression exp1;
+        private SchemeExpression exp2;
+
+        public SchemeExpressionPower(SchemeExpression expr1,
+            SchemeExpression expr2) {
+            exp1 = expr1;
+            exp2 = expr2;
+        }
+
+        public SchemeValue evaluate(SchemeEnvironment env)
+            throws SchemeException {
+            return SchemeFactoryManager.instance()
+                                       .create("SchemeExpressionInt",
+                ((int) (Math.pow(exp1.evaluate(env).asInt(),
+                    exp2.evaluate(env).asInt())))).evaluate(env);
+        }
+
+        public void prettyPrint(PrintStream out) {
+            out.print("(pow ");
+            exp1.prettyPrint(out);
+            out.print(" ");
+            exp2.prettyPrint(out);
+            out.print(")");
+        }
+    }
 }
 }}}