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  1. #include <iostream>
  2. #include <stack>	
  3. #include <string>	
  4. #include <cctype>	
  5.  
  6. using namespace std;
  7.  
  8. int main()
  9. {
  10. 	int i;
  11. 	char inputEx[128];
  12. 	char token;
  13. 	int value, value1, value2;
  14. 	stack<char> myStack;
  15.  
  16. 	cout << "Please enter the RPN inputEx to be evaluated: " << endl <<
  17. 		"(Note: Input must end with an equals sign (=))"
  18. 		<< ": " << endl;
  19.  
  20. 	cin.getline(inputEx, 128);
  21.  
  22. 	i = 0;
  23.  
  24. 	for(i=0; inputEx[i]!='='; i++)
  25. 	{
  26. 		token = inputEx[i];
  27.  
  28. 		if(token == ' ') continue;
  29.  
  30. 		if (isdigit(token))
  31. 		{
  32. 			value = token - '0';
  33. 			myStack.push(value);
  34. 		}
  35. 		else
  36. 		{
  37. 			value2 = myStack.top();
  38. 			myStack.pop();
  39. 			value1 = myStack.top();
  40. 			myStack.pop();
  41. 			switch(token)
  42. 			{
  43. 				case '+': value = value1 + value2;
  44. 				break;
  45. 				case '-': value = value1 - value2;
  46. 				break;
  47. 				case '*': value = value1*value2;
  48. 				break;
  49. 				case '/': value = value1/value2;
  50. 				break;
  51. 			}
  52. 			myStack.push(value);
  53. 		}
  54. 	}
  55.  
  56. 	value = myStack.top();
  57. 	myStack.pop();
  58.  
  59. 	cout << inputEx << " " << value << endl;
  60. 	cout << endl;
  61.  
  62. 	return 0;
  63. }
Success #stdin #stdout 0.01s 2820KB
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stdin
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1 2 3 + + =
stdout
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Please enter the RPN inputEx to be evaluated: 
(Note: Input must end with an equals sign (=)): 
1 2 3 + + = 6
https://ideone.com/7htsg
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
public

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