CPA AnswerSheet Programming Essentials in C++ Chapter 5 Assessment

1. What happens when you attempt to compile and run the
following code?
#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;
}

 It prints ABCD
 It prints CD
 It prints AB
 Compilation fails
2. What happens when you attempt to compile and run the
following code?
#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;
}

 It prints 0
 It prints 2
 Compilation fails
 It prints 1
3. What happens when you attempt to compile and run the
following code?
#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;
}

 It prints 2
 Compilation fails
 It prints 1
 It prints 0
4. What happens when you attempt to compile and run the
following code?
#include <iostream>
using namespace std;

class A {
int cnt;
void put(int v) { cout << cnt++; }
};

int main() {
A a;