Changes between Initial Version and Version 1 of GnappoProduct

Timestamp:

Jul 26, 2006, 7:02:23 PM (18 years ago)

Author:

gnappo

Comment:

--

GnappoProduct

@@ +1 @@
+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();
+                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));
+
+        }
+        
+
+
+}