first commit

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

@@ -0,0 +1,23 @@
+package org.nfunk.jep.function;
+
+import java.util.Stack;
+import org.nfunk.jep.ParseException;
+import org.nfunk.jep.type.Complex;
+
+public class SquareRoot extends PostfixMathCommand {
+  public void run(Stack paramStack) throws ParseException {
+    checkStack(paramStack);
+    Object object = paramStack.pop();
+    paramStack.push(sqrt(object));
+  }
+  
+  public Object sqrt(Object paramObject) throws ParseException {
+    if (paramObject instanceof Complex)
+      return ((Complex)paramObject).sqrt(); 
+    if (paramObject instanceof Number) {
+      double d = ((Number)paramObject).doubleValue();
+      return (d < 0.0D) ? (new Complex(d)).sqrt() : new Double(Math.sqrt(d));
+    } 
+    throw new ParseException("Invalid parameter type");
+  }
+}