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  1. #include<bits/stdc++.h>
  2. #include <iostream>
  3. using namespace std;
  4.  
  5. class BigInt {
  6. public:
  7. 	BigInt();
  8. 	BigInt(string x);
  9. 	BigInt(int x);
  10.     friend bool operator==(BigInt& b, BigInt& c) {
  11. 		if (b.isNegative == true && c.isNegative == true || 
  12. 			b.isNegative == false && c.isNegative == false) {
  13. 			string str1 = c.data;
  14. 			string str2 = b.data; 
  15. 				if (strcmp(str1.c_str(),str2.c_str()) == 0)
  16. 					return true;
  17. 					}
  18. 			return false; 
  19. 			}
  20.  
  21. 	friend ostream& operator<< (ostream& out, const BigInt& right) {
  22. 		out << right.data;
  23. 		return out;
  24. 	}
  25. private:
  26. 	string data;
  27. 	bool isNegative;
  28. };
  29.  
  30. BigInt::BigInt() {
  31. 	data = '0';
  32. 	isNegative = false;
  33. }
  34.  
  35. BigInt::BigInt(int x) {
  36. 	if (x < 0) {
  37. 		isNegative = true;
  38. 	}
  39. 	if (x > 0) {
  40. 	 isNegative = false;
  41. 	}
  42.     string str = to_string(x);
  43. 	if (str[0] == '-')
  44. 		str.erase(str.begin());
  45. 	data = str;
  46. }
  47.  
  48. BigInt::BigInt(string x) {
  49. 	int i = 0;
  50. 	string str;
  51. 	vector <string> v;
  52. 	while (x[i]) {
  53. 		if (isspace(x[i])) {
  54. 			i++;
  55. 		}
  56. 		if (x[i] == '-') {
  57. 			isNegative = true;
  58. 		}
  59. 		if (x[i] != '-') {
  60. 			isNegative = false;
  61. 		}
  62. 		if (isdigit(x[i]) || x[i] == '-' || x[i] == '+') {
  63. 			for (x[i]; isdigit(x[i]) || x[i] == '-'; i++) {
  64. 				str = str + x[i];
  65. 			}
  66. 		}
  67. 		if (x[i] != '+' || x[i] != '-' || !isdigit(x[i])) {
  68. 			break;
  69. 			}
  70.  
  71. 		}
  72. 		data = str; 
  73.  
  74. 	}
  75.  
  76. int main() {
  77. 	BigInt x, y, z;
  78. 	x = BigInt(4004);
  79. 	cout << x << endl;
  80. 	y = BigInt("4004 and more stuff");
  81. 	cout << y << endl;
  82. 	if ( x == y)
  83. 	cout << "true" << endl; 
  84. }
Success #stdin #stdout 0s 4432KB
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stdin
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Standard input is empty
stdout
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4004
-4004
https://ideone.com/m8PRXM
==
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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