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  1. #include <iostream>
  2. #include <map>
  3. #include <functional>
  4.  
  5. int
  6. main(int argc, char** argv)
  7. {
  8. 	std::map<char, std::function<double(double, double)>> ch2f{
  9. 		{'+', [] (double lhs, double rhs) -> auto { return lhs + rhs; }},
  10. 		{'*', [] (double lhs, double rhs) -> auto { return lhs * rhs; }},
  11. 		{'/', [] (double lhs, double rhs) -> auto { return lhs / rhs; }},
  12. 		{'-', [] (double lhs, double rhs) -> auto { return lhs - rhs; }}
  13. 	};
  14. 	double lhs, rhs;
  15. 	char op;
  16. 	std::cin >> lhs >> op >> rhs;
  17. 	std::cout << ch2f[ op ](lhs, rhs) << std::endl;
  18.  
  19. 	std::cin >> lhs >> op >> rhs;
  20. 	std::cout << ch2f[ op ](lhs, rhs) << std::endl;
  21. }
Success #stdin #stdout 0s 3420KB
comments (?)
stdin
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3+3
9/3
stdout
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6
3
https://ideone.com/UA68qh
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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