Operators and enumerated types CPPE2 M4 Test
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What is the output of the following snippet?
#include <iostream> using namespace std; class N { public: float x; N() { x = 0.0; } N(float a) {x = a; } N(N &n) { x = n.x; } N &operator<<(N &y) { return *new N(x * 10); } }; int main() { N a(2.0),b(4.0); N c = a << 1; cout << c.x; return 0; }
0
- Compilation fails
2
1
-
What is the output of the following snippet?
#include <iostream> #include <string> using namespace std; class N { public: float x; N() { x = 0.0; } N(float a) {x = a; } N(N &n) { x = n.x; } string operator==(N &n) { if(this != &n) return "true"; else return "false"; } }; int main() { N a(1.1), *b = &a; cout << (a == *b); return 0; }
- Compilation fails
- It prints an empty string
false
true
-
What is the output of the following snippet?
#include <iostream> using namespace std; class Int { public: int v; Int(int a) { v = a; } Int &operator--() { ++v; return *this; } Int &operator--(int v) { v+=2; return *this; } }; ostream &operator <<(ostream &o, Int &a) { return o << a.v++; } int main() { Int i = 0; cout << --i << i--; return 0; }
12
21
10
23
-
What is the output of the following snippet?
#include <iostream> using namespace std; class Int { public: int v; Int(int a) { v = a; } }; int main() { Int i = 1; cout << i; return 0; }
2
0
1
- Compilation fails
-
What is the output of the following snippet?
#include <iostream> using namespace std; enum T { A =2, B = -1, C }; T operator+(T t, int i) { switch(t) { case A: return T(0); case B: return static_cast<T>(2); default:return (T)1; } } int main() { T i = A + 2; cout << i; return 0; }
1
0
- Compilation fails
2
-
What is the output of the following snippet?
#include <iostream> using namespace std; class Int { public: int v; Int(int a) { v = a; } }; ostream &operator <<(ostream &o, Int &a) { return o << --a.v; } int main() { Int i = 1; cout << i; return 0; }
- Compilation fails
2
1
0
-
What is the output of the following snippet?
#include <iostream> using namespace std; class N { public: float x; N() { x = 0.0; } N(float a) {x = a; } N(N &n) { x = n.x; } N &operator%(N &y) { return *new N((int)x % (int)y.x); } }; int main() { N a(2.0),b(4.0); N c = a % b; cout << c.x; return 0; }
- Compilation fails
1
2
0
-
What is the output of the following snippet?
#include <iostream> using namespace std; string operator>(float l, float r) { if(int(l) > int(r)) return "true"; else return "false"; } int main() { float l =2.0, r =2.9999; cout << (l > r); return 0; }
false
- It prints an empty string
true
- Compilation fails
-
What is the output of the following snippet?
#include <iostream> using namespace std; class Int { public: int v; Int(int a) { v = a; } Int &operator--() { ++v; return *this; } }; ostream &operator <<(ostream &o, Int &a) { return o << --a.v; } int main() { Int i = 2; cout << i; return 0; }
0
1
- Compilation fails
2
-
What is the output of the following snippet?
#include <iostream> using namespace std; class Int { public: int v; Int(int a) { v = a; } Int &operator[](int x) { v+=x; } }; ostream &operator <<(ostream &o, Int &a) { return o << a.v; } int main() { Int i = 2; cout << i.v << i[2]; return 0; }
- Compilation fails
33
24
44
-
What is the output of the following snippet?
#include <iostream> using namespace std; enum T { A, B, C }; class Int { public: T v; Int(T a) { v = a; } }; ostream &operator <<(ostream &o, Int &a) { return o << a.v; } int main() { Int i = B; cout << i; return 0; }
1
0
- Compilation fails
B
-
What is the output of the following snippet?
#include <iostream> using namespace std; class N { public: string n; X(string s) : n(s) {} void operator() (X x) { cout << x.n; } }; int main() { X x("a", y("b"); x(y); y(x); return 0; }
ba
ab
- Compilation fails
- It prints an empty string
-
What is the output of the following snippet?
#include <iostream> using namespace std; class N { public: float x; N() { x = 0.0; } N(float a) {x = a; } N(N &n) { x = n.x; } }; N &operator=(N &y,float f) { return *new N(f); } int main() { N a; a = 2.0; cout << a.x; return 0; }
2
0
1
- Compilation fails
-
What is the output of the following snippet?
#include <iostream> using namespace std; enum T { A = 2, B = -1, C }; class Int { public: T v; Int(T a) { v = a; } Int & operator++() { v = C; return &this; } }; ostream &operator <<(ostream &o, Int &a) { ++a; return o << a.v; } int main() { Int i = B; cout << i; return 0; }
1
- Compilation fails
C
0
-
What is the output of the following snippet?
#include <iostream> using namespace std; class Int { public: int v; Int(int a) { v = a; } Int &operator--() { ++v; ++v; return *this; } }; ostream &operator <<(ostream &o, Int &a) { return o << a.v++; } int main() { Int i = 0; cout << --i; return 0; }
0
2
- Compilation fails
1
-
What is the output of the following snippet?
#include <iostream> using namespace std; class Int { public: int v; Int(int a) { v = a; } Int &operator++(int x) { v+=2; return *this; } }; ostream &operator <<(ostream &o, Int &a) { return o << a.v; } int main() { Int i = 0; cout << i++ << i.v; return 0; }
22
- Compilation fails
21
20
-
What is the output of the following snippet?
#include <iostream> using namespace std; class N { public: float x; N() { x = 0.0; } N(float a) {x = a; } N(N &n) { x = n.x; } N &operator=(float f) { x = f - 1; return *this; } }; int main() { N a; a = 2.0; cout << a.x; return 0; }
- Compilation fails
2
1
0
-
What is the output of the following snippet?
#include <iostream> using namespace std; class Int { public: int v; Int(int a) { v = a } }; ostream &operator <<(Int &a) { return cout << a.v; } int main() { Int i = 1; cout << i; return 0; }
0
2
- Compilation fails
1
-
What is the output of the following snippet?
#include <iostream> using namespace std; enum T { A = 2, B = -1, C }; class Int { public: T v; Int(T a) { v = a; } Int & operator++() { v += 2; return *this; } }; ostream &operator <<(ostream &o, Int &a) { ++a; return o << a.v; } int main() { Int i = B; cout << i; return 0; }
0
2
- Compilation fails
1
-
What is the output of the following snippet?
#include <iostream> #include <string> using namespace std; class N { public: float x; N() { x = 0.0; } N(float a) {x = a; } N(N &n) { x = n.x; } string operator==(float f) { if(int(x) == int(f)) return "true"; else return "false"; } }; int main() { N a(1.1); cout << ( a == 1.9); return 0; }
- Compilation fails
- It prints an empty string
true
false
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