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  1. #include <iostream>
  2. #include <stack> //stack header file
  3.  
  4. using namespace std; 
  5.  
  6. stack <int> operands;
  7.  
  8.  
  9. int main() 
  10. {
  11. 	int input(); 
  12. 	void evaluate(); 
  13.  
  14. }
  15.  
  16.  
  17.  
  18. int input(int, char) //user inputs 3 items into a stack
  19. {
  20. 	int item1, item2, item3; //push 3 input items onto a stack and ask for the two operators
  21. 	char op, op2; 
  22. 	cout << "Enter your postfix expression" << endl;
  23. 	cout << "(Enter three numbers followed by two operators, one per line)" << endl;  
  24. 	cin >> item1; 
  25. 	operands.push(item1);
  26. 	cin >> item2;
  27. 	operands.push(item2);
  28. 	cin >> item3; 
  29. 	operands.push(item3);
  30. 	cin >> op;
  31. 	cin >> op2; 
  32. 	return op, op2, item1, item2, item3;
  33.  
  34. }
  35.  
  36. void evaluate(char &op, char &op2, int &item1, int &item2, int &item3) //evaluate function operations included
  37. {
  38.  
  39.  
  40. 	item3 = operands.top();  //ask for the second operator and do the destignated operation
  41. 	operands.pop();
  42. 	item2 = operands.top(); 
  43. 	operands.pop(); 
  44. 	if(op =='+') 
  45. 		item2 = item3+item2; 
  46. 	else if(op=='*')
  47. 		item2 = item3*item2; 
  48. 	else if(op=='-')
  49. 		item2 = item3-item2;
  50. 	else if(op=='/')
  51. 		item2 = item3/item2; 
  52. 	else if(op=='%')
  53. 		item2 = item3%item2;
  54. 	else 
  55. 		cout << "You have entered an incorrect operator" << endl; 
  56. 	operands.push(item2); //push the result back to top of stack
  57.  
  58. 	operands.pop();
  59. 	operands.pop();
  60.  
  61. 	if(op2 =='+') 
  62. 		item1 = item2+item1;
  63. 	else if(op2=='*')
  64. 		item1 = item2+item1;
  65. 	else if(op2=='-')
  66. 		item1 = item2-item1;
  67. 	else if(op2=='/')
  68. 		item1 = item2/item1;
  69. 	else if(op2=='%')
  70. 		item1=item2%item1; 
  71. 	else
  72. 		 cout << "You have entered an incorrect operator" << endl; 
  73. 	operands.push(item1); //push result back to top of stack
  74. 	cout << "The number remaining in the stack after those operations is " << item1 << endl; 
  75.  
  76. }
  77.  
Success #stdin #stdout 0s 3472KB
comments (?)
stdin 
Standard input is empty
stdout 
Standard output is empty
https://ideone.com/r4L70S
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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