/*
* 練習問題22.15 p.580
* （少なくとも）基本演算子+, -, *, /, %とすべてのMathあるいはStrictMathの機能を持つ電卓を作成しなさい。
* （最も簡単な形式は、おそらく、演算子の優先順位が問題にならない逆ポーランドのスタック電卓です。）
*/
package ch22.ex22_15;
import java.util.Stack;
public class SimpleCalculator
{
static Stack<Object> stack = new Stack<Object>();
static String tmp = null;
static String[] splitString;
// need Reversed Polish Notation(delimiter = " ")
static double calc(String expression)
{
splitString = expression.split(" ");
for (int i = 0; i < splitString.length; i++)
{
switch (splitString[i].charAt(0))
{
case '+':
tmp = stack.pop().toString();
stack.push(Double.valueOf(stack.pop().toString()) + Double.valueOf(tmp));
continue;
case '-':
tmp = stack.pop().toString();
stack.push(Double.valueOf(stack.pop().toString()) - Double.valueOf(tmp));
continue;
case '*':
tmp = stack.pop().toString();
stack.push(Double.valueOf(stack.pop().toString()) * Double.valueOf(tmp));
continue;
case '/':
tmp = stack.pop().toString();
stack.push(Double.valueOf(stack.pop().toString()) / Double.valueOf(tmp));
continue;
case '%':
tmp = stack.pop().toString();
stack.push(Double.valueOf(stack.pop().toString()) % Double.valueOf(tmp));
continue;
}
if (splitString[i].equals("sin"))
{
stack.push(Math.sin(Double.valueOf(stack.pop().toString())));
continue;
}
if (splitString[i].equals("cos"))
{
stack.push(Math.cos(Double.valueOf(stack.pop().toString())));
continue;
}
if (splitString[i].equals("tan"))
{
stack.push(Math.tan(Double.valueOf(stack.pop().toString())));
continue;
}
if (splitString[i].equals("asin"))
{
stack.push(Math.asin(Double.valueOf(stack.pop().toString())));
continue;
}
if (splitString[i].equals("acos"))
{
stack.push(Math.acos(Double.valueOf(stack.pop().toString())));
continue;
}
if (splitString[i].equals("atan"))
{
stack.push(Math.atan(Double.valueOf(stack.pop().toString())));
continue;
}
if (splitString[i].equals("atan2"))
{
tmp = stack.pop().toString();
stack.push(Math.atan2(Double.valueOf(stack.pop().toString()), Double.valueOf(tmp)));
continue;
}
if (splitString[i].equals("toRadians"))
{
stack.push(Math.toRadians(Double.valueOf(stack.pop().toString())));
continue;
}
if (splitString[i].equals("toDegrees"))
{
stack.push(Math.toDegrees(Double.valueOf(stack.pop().toString())));
continue;
}
if (splitString[i].equals("exp"))
{
stack.push(Math.exp(Double.valueOf(stack.pop().toString())));
continue;
}
if (splitString[i].equals("sinh"))
{
stack.push(Math.sinh(Double.valueOf(stack.pop().toString())));
continue;
}
if (splitString[i].equals("cosh"))
{
stack.push(Math.cosh(Double.valueOf(stack.pop().toString())));
continue;
}
if (splitString[i].equals("tanh"))
{
stack.push(Math.tanh(Double.valueOf(stack.pop().toString())));
continue;
}
if (splitString[i].equals("pow"))
{
tmp = stack.pop().toString();
stack.push(Math.pow(Double.valueOf(stack.pop().toString()), Double.valueOf(tmp)));
continue;
}
if (splitString[i].equals("log"))
{
stack.push(Math.log(Double.valueOf(stack.pop().toString())));
continue;
}
if (splitString[i].equals("log10"))
{
stack.push(Math.log10(Double.valueOf(stack.pop().toString())));
continue;
}
if (splitString[i].equals("sqrt"))
{
stack.push(Math.sqrt(Double.valueOf(stack.pop().toString())));
continue;
}
if (splitString[i].equals("cbrt"))
{
stack.push(Math.cbrt(Double.valueOf(stack.pop().toString())));
continue;
}
if (splitString[i].equals("signum"))
{
stack.push(Math.signum(Double.valueOf(stack.pop().toString())));
continue;
}
if (splitString[i].equals("ceil"))
{
stack.push(Math.ceil(Double.valueOf(stack.pop().toString())));
continue;
}
if (splitString[i].equals("floor"))
{
stack.push(Math.floor(Double.valueOf(stack.pop().toString())));
continue;
}
if (splitString[i].equals("rint"))
{
stack.push(Math.rint(Double.valueOf(stack.pop().toString())));
continue;
}
if (splitString[i].equals("round"))
{
stack.push(Math.round(Double.valueOf(stack.pop().toString())));
continue;
}
if (splitString[i].equals("abs"))
{
stack.push(Math.abs(Double.valueOf(stack.pop().toString())));
continue;
}
if (splitString[i].equals("max"))
{
tmp = stack.pop().toString();
stack.push(Math.max(Double.valueOf(stack.pop().toString()), Double.valueOf(tmp)));
continue;
}
if (splitString[i].equals("min"))
{
tmp = stack.pop().toString();
stack.push(Math.min(Double.valueOf(stack.pop().toString()), Double.valueOf(tmp)));
continue;
}
if (splitString[i].equals("hypot"))
{
tmp = stack.pop().toString();
stack.push(Math.hypot(Double.valueOf(stack.pop().toString()), Double.valueOf(tmp)));
continue;
}
stack.push(splitString[i]);
}
return Double.valueOf(stack.pop().toString());
}
public static void main(String[] args)
{
System.out.println(SimpleCalculator.calc("1 2 + 3 4 - +"));
System.out.println(SimpleCalculator.calc("100 200 max 200 5000 min +"));
System.out.println(SimpleCalculator.calc("4 sqrt 8 pow"));
}
}