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CPA – Programming Essentials in C++ Chapter 2 Module 1 Exam Answers
Question 1: What is the output of the following snippet?
#include <iostream>
using namespace std;
class A {
public:
float v;
A() { v = 1.0; }
A(A &a) { A::v = a.v; cout << “1”; }
~A() { cout << “0”; }
float set(float v) {
A::v = v;
return v;
}
float get(float v) {
return A::v;
}
};
int main() {
A a,*b = new A(a),*c = new A(*b);
c->get(b->get(a.set(1.0)));
delete b;
delete c;
return 0;
}
- 1100
- Compilation fails
- 11000
- 110
Question 2: What is the output of the following snippet?
#include <iostream>
using namespace std;
class A {
public:
float v;
float set(float v) {
A::v += 1.0;
return v;
}
float set(void) {
A::v = v + 1.0;
return 0.0;
}
float get(float v) {
v += A::v;
return v;
}
};
int main() {
A a;
cout << a.get(a.set(a.set(a.set())));
return 0;
}
- 3
- 1
- 2
- Complilation failed
Question 3: What is the output of the following snippet?
#include <iostream>
using namespace std;
class A {
public:
float v;
float set(float v) {
A::v += 1.0;
A::v = v + 1.0;
return v;
}
float get(float v) {
v += A::v;
return v;
}
};
int main() {
A a;
cout << a.get(a.set(a.set(0.5)));
return 0;
}
- Compilation fails
- 2
- 2.5
- 1.5
Question 4: What is the output of the following snippet?
#include <iostream>
using namespace std;
class A {
public:
A(A &a) { v = a.get(0.0); }
A(float v) { A::v = v; }
float v;
float set(float v) {
A::v += v;
return v;
}
float get(float v) {
return A::v + v;
}
};
int main() {
A a(0.), b = a;
cout << a.get(b.set(1.5));
return 0;
}
- 1.5
- 4.5
- Compilation fails
- 2.5
Question 5: What is the output of the following snippet?
#include <iostream>
using namespace std;
class A {
public:
float v;
float set(float v) {
v += 1.0;
this -> v = v;
return v;
}
float get(float d) {
v += 1.0;
return v;
}
};
int main() {
A a;
cout << a.get(a.set(a.set(0.5)));
return 0;
}
- 3.5
- 2.5
- 1.5
- Compilation fails
Question 6: What is the output of the following snippet?
#include <iostream>
using namespace std;
class A {
public:
int cnt;
void put(int v);
};
void A::put(int v) { cout << ++cnt; }
int main() {
A a[2];
a[0].cnt = 0;
a[1].cnt = 1;
a[a[0].cnt].put(a[1].cnt);
return 0;
}
- Compilation fails
- 0
- 1
- 2
Question 7: What is the output of the following snippet?
#include <iostream>
#include <string>
using namespace std;
class A {
public: string a(string b) {
return b.substr(0,2);
}};
class B {
public: string a(string b) {
return b.substr(2,2);
}};
int main() {
A a;
B b;
cout << a.a(b.a(“ABCD”));
return 0;
}
- CD
- ABCD
- AB
- Compilation fails
Question 8: What is the output of the following snippet?
#include <iostream>
using namespace std;
class A {
public:
A(float v) { A::v = v; }
float v;
float set(float v) {
A::v = v;
return v;
}
float get(float v) {
return A::v;
}
};
int main() {
A *a = new A(1.0), *b = new A(*a);
cout << a->get(b->set(a->v));
return 0;
}
- 2
- Compilation fails
- 1
- 4
Question 9: What is the output of the following snippet?
#include <iostream>
using namespace std;
class A {
public:
A(A &a) { v = a.get(0.0); }
A(float v) { A::v = v; }
float v;
float set(float v) {
A::v += v;
return v;
}
float get(float v) {
return A::v + v;
}
};
int main() {
A *a = new A(1.0), *b = new A(*a);
cout << a->get(b->set(a->v));
return 0;
}
- 4
- 1
- Compilation fails
- 2
Question 10: What is the output of the following snippet?
#include <iostream>
using namespace std;
class A {
public:
float v;
A(float x) : v(x) {}
};
class B {
public:
A a;
float b;
B(float x) : a(x + 1) { b = a.v; }
};
int main() {
B b(2.0);
cout << b.b;
return 0;
}
- 2
- Compilation fails
- 3
- 1
Question 11: What is the output of the following snippet?
#include <iostream>
using namespace std;
class A {
public:
A() { v = 2.5; }
float v;
float set(float v) {
A::v += 1.0;
return v;
}
float get(float v) {
v += A::v;
return v;
}
};
int main() {
A a;
cout << a.get(a.set(1.5));
return 0;
}
- 1
- Compilation fails
- 3
- 5
Question 12: What is the output of the following snippet?
#include <iostream>
using namespace std;
class A {
public:
float v;
A() { v = 1.0; }
A(A &a) { A::v = a.v; cout << “1”; }
~A() { cout << “0”; }
float set(float v) {
A::v = v;
return v;
}
float get(float v) {
return A::v;
}
};
int main() {
A a, b = a;
return 0;
}
- 11100
- Compilation fails
- 1100
- 100
Question 13: What is the output of the following snippet?
#include <iostream>
using namespace std;
class A {
public:
A() { v = 2.5; }
float v;
float set(float v) {
A::v += 1.0;
return v;
}
float get(float v) {
v += A::v;
return v;
}
};
int main() {
A a;
a.A();
cout << a.get(a.set(1.5));
return 0;
}
- 5
- 3
- 1
- Compilation fails
Question 14: What is the output of the following snippet?
#include <iostream>
using namespace std;
class A {
public:
A(float v) { A::v = v; }
float v;
float set(float v) {
A::v += v;
return v;
}
float get(float v) {
return A::v + v;
}
};
int main() {
A a,b(1.0);
cout << a.get(b.set(1.5));
return 0;
}
- 4
- Cmpilation fails
- 2
- 1
Question 15: What is the output of the following snippet?
#include <iostream>
using namespace std;
class A {
public:
A(A *v) { A::v = v; }
A() { A::v = 1.0; }
float v;
float set(float v) {
A::v = v;
return v;
}
float get(float v) {
return A::v;
}
};
int main() {
A a,*b = new A(a);
cout << a->get(b->set(a->v));
return 0;
}
- Compilation fails
- 2
- 4
- 1
Question 16: What is the output of the following snippet?
#include <iostream>
using namespace std;
class A {
public:
float v;
A() : v(1.0) {}
A(A &a) : v(2.0) {}
A(float f) : v(3.0) {}
float get() {
return A::v;
}
};
int main() {
A a, b(a.get()), c(b);
cout << a.v + b.v + c.v;
return 0;
}
- Compilation fails
- 9
- 6
- 3
Question 17: What is the output of the following snippet?
#include <iostream>
using namespace std;
class A {
public:
A() { v = 2.5; }
A(float v) { A::v = v + 1.0; }
float v;
float set(float v) {
A::v += 1.0;
return v;
}
float get(float v) {
v += A::v;
return v;
}
};
int main() {
A a,b(1.0);
cout << a.get(b.set(1.5));
return 0;
}
- 2
- 4
- 1
- Compilation fails
Question 18: What is the output of the following snippet?
#include <iostream>
using namespace std;
class A {
int cnt;
void put(int v) { cout << cnt++; }
};
int main() {
A a;
a.cnt = 0;
a.put(1);
a.put(1);
return 0;
}
- 1
- 0
- Compilation fails
- 2
Question 19: What is the output of the following snippet?
#include <iostream>
using namespace std;
class A {
public:
int data[3];
private:
int cnt;
public:
void put(int v) { data[cnt++] = v; }
int take() { int c = cnt; cnt = 0; return c; }
};
int main() {
A a;
a.take();
a.put(a.take());
a.put(1);
cout << a.data[0];
return 0;
}
- 1
- 2
- Compilation fails
- 0
Question 20: What is the output of the following snippet?
#include <iostream>
using namespace std;
class A {
int data[3];
public:
int cnt;
void put(int v) { data[cnt++] = v; }
};
int main() {
A a;
a.cnt = 0;
a.put(1);
a.put(1);
cout << a.cnt;
return 0;
}
- 0
- 2
- Compilation fails
- 1
