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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static boolean isNumber(String s){
  11. 		try{
  12. 			Integer.parseInt(s);
  13. 			return true;
  14. 		}catch(Exception e){
  15. 			return false;
  16. 		}
  17. 	}
  18.  
  19. 	public static String calc(String s1, String s2, String method){
  20. 		String ret = "";
  21.         switch(method){
  22.             case "+":
  23.                 ret = String.valueOf(Integer.parseInt(s1) + Integer.parseInt(s2));
  24.                 break;
  25.             case "-":
  26.                 ret = String.valueOf(Integer.parseInt(s1) - Integer.parseInt(s2));
  27.                 break;
  28.             case "*":
  29.                 ret = String.valueOf(Integer.parseInt(s1) * Integer.parseInt(s2));
  30.                 break;
  31.             case "/":
  32.                 ret = String.valueOf(Integer.parseInt(s1) / Integer.parseInt(s2));
  33.                 break;
  34.         }
  35.         return ret;
  36. 	}
  37.  
  38. 	public static void main (String[] args) throws java.lang.Exception
  39. 	{
  40. 		Stack<String> s = new Stack();
  41.  
  42. 		String test = "3 5 + 1 * 2 3 - -";
  43.  
  44. 		String[] sa = test.split(" ");
  45.  
  46. 		for(int i = 0; i < sa.length; i++){
  47. 			if(isNumber(sa[i])){
  48. 				s.push(sa[i]);
  49. 			}else{
  50. 				String s2 = s.pop();
  51. 				String s1 = s.pop();
  52. 				String newVal = calc(s1, s2, sa[i]);
  53. 				s.push(newVal);
  54. 			}
  55. 		}
  56.  
  57. 		System.out.println(s.pop());
  58. 	}
  59. }
Success #stdin #stdout 0.09s 320320KB
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https://ideone.com/Gbqsy7
language:
Java (HotSpot 12)
created:
11 years ago
visibility:
public

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