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  1. #include <vector>
  2. #include <string>
  3. #include <iostream>
  4. using namespace std;
  5.  
  6. void f1()
  7. {
  8. 	int a = 1;
  9. 	int b = 2;
  10.  
  11. 	cout<<++a+b--<<endl;
  12. }
  13.  
  14. namespace test2
  15. {
  16. 	//Найти ошибку компиляции
  17. 	/*void f(string & s)
  18. 	{
  19. 		cout<<s<<endl;
  20. 	}*/
  21. 	//Решение
  22. 	void f(const string & s)
  23. 	{
  24. 		cout<<s<<endl;
  25. 	}	
  26.  
  27. }
  28. void test3()
  29. {
  30. 	vector<int> v;
  31. 	v.reserve(10);
  32. 	for(int i=0;i<10;++i)
  33. 		v[i]=1;
  34. 	v.push_back(2);
  35. 	for(auto a:v)
  36. 		cout<<a<<endl;
  37. }
  38.  
  39. //Что в фрагменте кода неправильно
  40. //Удаление массива - delete[] a
  41. //Считают, что есть ещё ошибки, какие не знаю
  42. void test4()
  43. {
  44. 	char* a=new char[10];
  45. 	if(a)
  46. 	{
  47. 		delete a;
  48. 	}
  49. }
  50.  
  51. namespace test5
  52. {
  53. 	struct A {
  54. 	virtual void f(){cout<<"A"<<endl;}
  55. 	};
  56. 	struct B {
  57. 	void f(){cout<<"B"<<endl;}
  58. 	};	
  59. 	struct C:A,B {
  60. 	void f(){cout<<"C"<<endl;}
  61. 	};	
  62. }
  63.  
  64. namespace test6
  65. {
  66. 	template<class T>
  67. 	struct A {
  68. 	virtual void f(){T()();}
  69. 	};
  70. 	struct B {
  71. 	void operator()(){cout<<"B"<<endl;}
  72. 	};	
  73. 	struct C:B {
  74. 	void operator()(){cout<<"C"<<endl;}
  75. 	};	
  76. 	template<>
  77. 	struct A<B>
  78. 	{
  79. 		void f()
  80. 		{
  81. 			cout<<"A"<<endl;
  82. 		}
  83. 	};
  84. }
  85.  
  86. namespace test7
  87. {
  88. 	struct A
  89. 	{
  90. 		A()
  91. 		{
  92. 			cout<<"construct"<<endl;
  93. 		}
  94. 		A(const A&)
  95. 		{
  96. 			cout<<"copy"<<endl;
  97. 		}
  98. 		A& operator=(const A&)
  99. 		{
  100. 			cout<<"assign"<<endl;
  101. 			return *this;
  102. 		}
  103. 	};
  104.  
  105. 	A f()
  106. 	{
  107. 		return A();
  108. 	}
  109. }
  110.  
  111. int main()
  112. {
  113. 	cout<<"-----------------test1---------------------\n";
  114. 	f1();
  115. 	cout<<"-----------------test2---------------------\n";
  116. 	test2::f("hello");
  117. 	cout<<"-----------------test3---------------------\n";
  118. 	test3();
  119. 	cout<<"-----------------test4---------------------\n";
  120. 	test4();
  121. 	cout<<"-----------------test5---------------------\n";
  122. 	test5::A* a = new test5::C();
  123. 	test5::B* b = new test5::C();
  124. 	a->f();
  125. 	b->f();
  126. 	cout<<"-----------------test6---------------------\n";
  127. 	test6::A<test6::B>().f();
  128. 	test6::A<test6::C>().f();
  129. 	cout<<"-----------------test7---------------------\n";
  130. 	test7::A a1 = test7::f();
  131. 	test7::A a2 = a1;
  132. 	return 0;
  133. }
Success #stdin #stdout 0s 3472KB
comments (?)
stdin
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Standard input is empty
stdout
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-----------------test1---------------------
4
-----------------test2---------------------
hello
-----------------test3---------------------
2
-----------------test4---------------------
-----------------test5---------------------
C
B
-----------------test6---------------------
A
C
-----------------test7---------------------
construct
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https://ideone.com/Pv89YH
language:
C++14 (clang 8.0)
created:
8 years ago
visibility:
public

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