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  1. #include <iostream>
  2.  
  3. struct Double
  4. {
  5. 	int characteristic;
  6. 	char decimal;
  7. 	int mantissa;
  8.  
  9. 	friend std::ostream &operator <<(std::ostream &stm, Double const &rhs)
  10. 	{
  11. 		return stm << rhs.characteristic << rhs.decimal << rhs.mantissa;
  12. 	}
  13.  
  14. 	friend std::istream &operator >>(std::istream &stm, Double &rhs)
  15. 	{
  16. 		return stm >> rhs.characteristic >> rhs.decimal >> rhs.mantissa;
  17. 	}
  18.  
  19. 	Double operator-(Double const &rhs) const
  20. 	{
  21. 		Double result = *this;
  22. 		if(rhs.mantissa > result.mantissa)
  23. 		{
  24. 			--result.characteristic;
  25. 			result.mantissa += 100;
  26. 		}
  27.  
  28. 		result.characteristic -= rhs.characteristic;
  29. 		result.mantissa -= rhs.mantissa;
  30.  
  31. 		return result;
  32. 	}
  33. };
  34.  
  35. int main()
  36. {
  37. 	Double itemCost;
  38. 	std::cout << "Please enter the item cost: ";
  39. 	std::cin >> itemCost;
  40.  
  41. 	Double amountPaid;
  42. 	std::cout << "Please enter the amount paid: ";
  43. 	std::cin >> amountPaid;
  44.  
  45. 	Double change = amountPaid - itemCost;
  46. 	std::cout << "Change due $" << change << std::endl;
  47. 	//now you can get the exact change easy
  48.  
  49. 	return 0;
  50. }
Success #stdin #stdout 0s 3348KB
comments (?)
stdin 
15.55
20.0
stdout 
Please enter the item cost: Please enter the amount paid: Change due $4.45
https://ideone.com/mwlr1B
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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