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  1. #include <string>
  2. #include <algorithm>
  3. #include <iostream>
  4.  
  5. using  int128 =   signed __int128;
  6. using uint128 = unsigned __int128;
  7.  
  8. namespace int128_io {
  9.  
  10. 	inline auto char_to_digit(int chr) {
  11. 	    return static_cast<int>(isalpha(chr) ? 10+tolower(chr)-'a': chr-'0'); }
  12.  
  13. 	inline auto digit_to_char(int digit) {
  14.     	return static_cast<char>(digit > 9 ? 'a'+digit-10: '0'+digit); }
  15.  
  16. 	template<class integer>
  17. 	inline auto to_int(const std::string &str, size_t *idx = nullptr, int base = 10) {
  18. 		size_t i = idx != nullptr ? *idx : 0;
  19. 		const auto n = str.size();
  20. 		const auto neg = str[i] == '-';
  21. 		integer num = 0;
  22. 		if (neg)
  23. 			++i;
  24. 		while (i < n)
  25. 			num *= base, num += char_to_digit(str[i++]);
  26. 		if (idx != nullptr)
  27. 			*idx = i;
  28. 		return neg ? -num : num; }
  29.  
  30. 	template<class integer>
  31. 	inline auto to_string(integer num, int base = 10) {
  32. 		const auto neg = num < 0;
  33. 		std::string str;
  34. 		if (neg)
  35. 			num = -num;
  36. 		do
  37. 			str += digit_to_char(num%base), num /= base;
  38. 		while (num > 0);
  39. 		if (neg)
  40. 			str += '-';
  41. 		std::reverse(str.begin(),str.end());
  42. 		return str; }
  43.  
  44. 	inline auto next_str(std::istream &stream) { std::string str; stream >> str; return str; }
  45.  
  46. 	template<class integer>
  47. 	inline auto& read(std::istream &stream, integer &num) {
  48. 		num = to_int<integer>(next_str(stream));
  49. 		return stream; }
  50.  
  51. 	template<class integer>
  52. 	inline auto& write(std::ostream &stream, integer num) { return stream << to_string(num); } }
  53.  
  54. using namespace std;
  55.  
  56. inline auto& operator>>(istream &stream,  int128 &num) { return int128_io::read(stream,num); }
  57. inline auto& operator>>(istream &stream, uint128 &num) { return int128_io::read(stream,num); }
  58. inline auto& operator<<(ostream &stream,  int128  num) { return int128_io::write(stream,num); }
  59. inline auto& operator<<(ostream &stream, uint128  num) { return int128_io::write(stream,num); }
  60.  
  61. inline auto uint128_max() {
  62. 	uint128 ans = 0;
  63.     for (uint128 pow = 1; pow > 0; pow <<= 1)
  64. 		ans |= pow;
  65.     return ans; }
  66.  
  67. int main() {
  68. 	int128 x, y;
  69. 	if (cin >> x >> y, cout << x << " + " << y << " = " << x+y << endl, x > y)
  70. 		cout << x << " > " << y << endl;
  71. 	else
  72. 		cout << x << " <= " << y << endl;
  73. 	cout << "maximum unsigned 128-bit integer 2**128 - 1 = " << uint128_max(); }
  74.  
Success #stdin #stdout 0.01s 5304KB
comments (?)
stdin
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10000000000000000000000000 -20000000000000000000000000
stdout
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10000000000000000000000000 + -20000000000000000000000000 = -10000000000000000000000000
10000000000000000000000000 > -20000000000000000000000000
maximum unsigned 128-bit integer 2**128 - 1 = 340282366920938463463374607431768211455
https://ideone.com/ppqIps
GNU C support for 128-bit integer arithmetics.
language:
C++14 (gcc 8.3)
created:
296 days ago
visibility:
secret

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