public void run(Stack inStack) throws ParseException {
checkStack(inStack); // check the stack
Object param2 = inStack.pop();
Object param1 = inStack.pop();
inStack.push(power(param1, param2));
}
public void run(Stack inStack) throws ParseException {
checkStack(inStack); // check the stack
Object param = inStack.pop();
inStack.push(cos(param)); // push the result on the inStack
return;
}