Merge branch 'master' of /Users/ernestoestrada/IdeaProjects/PPL-Fall-2018 with conflicts.

2018-10-22 12:40:13 -06:00
parent 216d31ca59
commit 13efc3fd81
6 changed files with 117 additions and 40 deletions
@@ -0,0 +1,87 @@
+  // ask this node to execute itself
+  // (for nodes that don't return a value)
+   public void execute() {
+
+      if ( kind.equals("stmts") ) {
+          // insert code here for Exercise 15
+      }
+
+      else if ( kind.equals("prtstr") ) {
+         System.out.print( info );
+      }
+      
+      else if ( kind.equals("prtexp") ) {
+          // insert code here for Exercise 15
+      }
+      
+      else if ( kind.equals("nl") ) {
+         System.out.print( "\n" );
+      }
+      
+      else if ( kind.equals("sto") ) {
+          // insert code here for Exercise 15
+      }
+      
+      else {
+         error("Unknown kind of node [" + kind + "]");     
+      }
+
+   }// execute
+    
+   // compute and return value produced by this node
+   public double evaluate() {
+
+      if ( kind.equals("num") ) {
+         return Double.parseDouble( info );
+      }
+
+      else if ( kind.equals("var") ) {
+          // insert code here for Exercise 15
+      }
+
+      else if ( kind.equals("+") || kind.equals("-") ) {
+          // insert code here for Exercise 15
+      }
+
+      else if ( kind.equals("*") || kind.equals("/") ) {
+          // insert code here for Exercise 15
+       }
+ 
+       else if ( kind.equals("input") ) {
+          return keys.nextDouble();          
+       }
+       
+       else if ( kind.equals("sqrt") || kind.equals("cos") ||
+                 kind.equals("sin") || kind.equals("atan")    
+               ) {
+          double value = first.evaluate();
+
+          if ( kind.equals("sqrt") )
+             return Math.sqrt(value);
+          else if ( kind.equals("cos") )
+             return Math.cos( Math.toRadians( value ) );
+          else if ( kind.equals("sin") )
+             return Math.sin( Math.toRadians( value ) );
+          else if ( kind.equals("atan") )
+             return Math.toDegrees( Math.atan( value ) );
+          else {
+             error("unknown function name [" + kind + "]");
+             return 0;
+          }
+            
+       }
+       
+       else if ( kind.equals("pow") ) {
+          // insert code here for Exercise 15
+       }
+
+       else if ( kind.equals("opp") ) {
+          // insert code here for Exercise 15
+       }
+
+       else {
+          error("Unknown node kind [" + kind + "]");
+          return 0;
+       }
+       
+   }// evaluate