first commit

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

@@ -0,0 +1,21 @@
+package org.nfunk.jep.function;
+
+import java.util.Stack;
+import org.nfunk.jep.ParseException;
+import org.nfunk.jep.type.Complex;
+
+public class Tangent extends PostfixMathCommand {
+  public void run(Stack paramStack) throws ParseException {
+    checkStack(paramStack);
+    Object object = paramStack.pop();
+    paramStack.push(tan(object));
+  }
+  
+  public Object tan(Object paramObject) throws ParseException {
+    if (paramObject instanceof Complex)
+      return ((Complex)paramObject).tan(); 
+    if (paramObject instanceof Number)
+      return new Double(Math.tan(((Number)paramObject).doubleValue())); 
+    throw new ParseException("Invalid parameter type");
+  }
+}