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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 void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 		String s = "1+1-1";
  13. 		char op = '\0';
  14. 		int num1 = 0, num2 = 0;
  15. 		s+="+";
  16. 		for (int i = 0; i < s.length(); i++)
  17. 		{
  18. 			if (s.charAt(i) >= '0' && s.charAt(i) <= '9')
  19. 			{
  20. 				if (op == '\0')
  21. 				{
  22. 					num1 = num1 * 10 + (int)(s.charAt(i) - '0');
  23. 				}
  24. 				else
  25. 				{
  26. 					num2 = num2 * 10 + (int)(s.charAt(i) - '0');
  27. 				}
  28. 			}
  29. 			if (s.charAt(i) == '+' || s.charAt(i) == '-')
  30. 			{
  31. 				if (op == '\0')
  32. 				{
  33. 					op = s.charAt(i);
  34. 				}
  35. 				else
  36. 				{
  37. 					if (op == '+')
  38. 						num1 = num1 + num2;
  39. 					else
  40. 						num1 = num1 - num2;
  41. 					num2 = 0;
  42. 					op = s.charAt(i);
  43. 				}
  44. 			}
  45. 		}
  46. 		System.out.println(num1);
  47. 	}
  48. }
Success #stdin #stdout 0.11s 320256KB
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https://ideone.com/GGNHkR
language:
Java (HotSpot 12)
created:
10 years ago
visibility:
public

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