fork download 
  1. #include <iostream>
  2.  
  3. namespace java { namespace lang {
  4. class Object;
  5. class String;
  6.  
  7. class Object 
  8. {
  9. public:
  10. 	Object() { }
  11. 	virtual String toString() const ;
  12. };
  13. class String : public Object {
  14. 	friend void println(String& str);
  15. protected:
  16. 	char *str;
  17. 	unsigned long len;
  18. public:
  19. 	String() { str = new char[1]; *str = '\0'; len = 0; } 
  20. 	String(unsigned long val);
  21. 	String(char* s);
  22. 	String(const String& another);
  23. 	~String() { delete [] str; }
  24. 	String toString() const;
  25. 	unsigned long length() const;
  26. 	String operator + (const String& another) const;
  27. 	String& operator = (const String& ref);
  28. };
  29.  
  30. String Object::toString() const {
  31. 	return String("Object:") + String((unsigned long)this);
  32. }
  33.  
  34. String::String(unsigned long val) {
  35. 	char temp[33];
  36. 	unsigned long digit = 0;
  37. 	do {
  38. 		temp[digit] = (char)(val % 10);
  39. 		val /= 10;
  40. 		digit++;
  41. 	} while (val > 0);
  42. 	str = new char[digit + 1];
  43. 	str[digit] = '\0';
  44. 	len = digit;
  45. 	for (unsigned long i = 0; i < digit; ++i) {
  46. 		str[i] = temp[digit - i - 1] + '0';
  47. 	}
  48. }
  49.  
  50. String::String(char *s) {
  51. 	len = 0;
  52. 	char *t;
  53. 	for (t = s; *t != '\0'; ++t) {
  54. 		len++;
  55. 	}
  56. 	str = new char[len + 1];
  57. 	for (unsigned long i = 0; i < len; ++i) {
  58. 		str[i] = s[i];
  59. 	}
  60. 	str[len] = '\0';
  61. }
  62.  
  63. String::String(const String& another) {
  64. 	len = another.len;
  65. 	str = new char[len + 1];
  66. 	for (unsigned long i = 0; i < len; ++i) {
  67. 		str[i] = another.str[i];
  68. 	}
  69. 	str[len] = '\0';
  70. }
  71.  
  72. String String::toString() const { return *this; }
  73. unsigned long String::length() const { return len; }
  74.  
  75. String String::operator + (const String& another) const {
  76. 	unsigned long sum = len + another.len;
  77. 	char *tempstr = new char[sum + 1];
  78. 	for (unsigned long i = 0; i < len; ++i) {
  79. 		tempstr[i] = str[i];
  80. 	}
  81. 	for (unsigned long i = 0; i < another.len; ++i) {
  82. 		tempstr[len + i] = another.str[i];
  83. 	}
  84. 	tempstr[sum] = '\0';
  85. 	String temp;
  86. 	delete [] temp.str;
  87. 	temp.str = tempstr;
  88. 	temp.len = sum;
  89. 	return temp;
  90. }
  91.  
  92. String& String::operator = (const String& ref) {
  93. 	delete [] str;
  94. 	len = ref.len;
  95. 	str = new char[len + 1];
  96. 	for (unsigned long i = 0; i < len; i++) {
  97. 		str[i] = ref.str[i];
  98. 	}
  99. 	str[len] = '\0';
  100. 	return *this;
  101. }
  102.  
  103. void println(String& str) {
  104. 	using namespace std;
  105. 	cout << str.str << endl;
  106. }
  107.  
  108. }}
  109.  
  110. int main() {
  111. 	using namespace java::lang;
  112. 	Object obj;
  113. 	String str(obj.toString());
  114. 	String hoge("Hoge");
  115. 	String h2(hoge + str);
  116. 	println(str);
  117. 	println(hoge);
  118. 	println(h2);
  119. 	return 0;
  120. }
Success #stdin #stdout 0s 3476KB
comments (?)
stdin 
Standard input is empty
stdout 
Object:3218099256
Hoge
HogeObject:3218099256
https://ideone.com/vjjs5n
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!