first commit

hrmsEjb/org/nfunk/jep/function/Exp.java

@@ -0,0 +1,26 @@
+package org.nfunk.jep.function;
+
+import java.util.Stack;
+import org.nfunk.jep.ParseException;
+import org.nfunk.jep.type.Complex;
+
+public class Exp extends PostfixMathCommand {
+  public void run(Stack paramStack) throws ParseException {
+    checkStack(paramStack);
+    Object object = paramStack.pop();
+    paramStack.push(exp(object));
+  }
+  
+  public Object exp(Object paramObject) throws ParseException {
+    if (paramObject instanceof Complex) {
+      Complex complex = (Complex)paramObject;
+      double d1 = complex.re();
+      double d2 = complex.im();
+      double d3 = Math.exp(d1);
+      return new Complex(d3 * Math.cos(d2), d3 * Math.sin(d2));
+    } 
+    if (paramObject instanceof Number)
+      return new Double(Math.exp(((Number)paramObject).doubleValue())); 
+    throw new ParseException("Invalid parameter type");
+  }
+}