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CPA – Programming Essentials in C++ Module 3 Exam Answers
Question 1: What is the output of the following snippet?
#include <iostream>
using namespace std;
struct S {
float *f;
};
void make(S *p, float x = 10)
{
float *f = new float;
*f = sizeof(*f) / sizeof(float) * 10;
p->f = f;
}
int main()
{
S *ss = new S;
make(ss);
cout << *(*ss).f;
delete ss->f;
delete ss;
}
- 10
- 40
- 20
- 80
Question 2: What is the output of the following snippet?
#include <iostream>
using namespace std;
int *make(int v)
{
int *p = new int;
*p = v + 1;
return p;
}
int *play(int &v)
{
cout << ++v;
return &v;
}
void remove(int *v)
{
delete v;
}
int main()
{
remove(play(*make(3)));
}
- 5
- 3
- 2
- 4
Question 3: What is the output of the following snippet?
#include <iostream>
#include <vector>
using namespace std;
int main()
{
vector<int> t = { 3, 2, 1 };
int *ptr = t.data() + 1;
(*(ptr + 1))++;
(*(ptr – 1))++;
cout << t[0] << t[1] << t[2];
}
- 422
- 333
- 123
- 321
Question 4: What is the output of the following snippet?
#include <iostream>
using namespace std;
int fun(long a)
{
return a / a;
}
int fun(int a)
{
return 2 * a;
}
int fun(double a = 3.0)
{
return a;
}
int main() {
cout << fun(1000000000L) << fun (1L) << fun(1.f);
}
- 111
- 222
- 444
- 333
Question 5: What is the output of the following snippet?
#include <iostream>
using namespace std;
int fun(float a, float b)
{
return a / b;
}
int main()
{
cout << fun(fun(1., 2.),fun(2., 1.));
}
- 0
- 1
- 2
- -1
Question 6: What is the output of the following snippet?
#include <iostream>
#include <string>
using namespace std;
string fun(string t, string s = “x”, int r = 1)
{
while(–r)
s += s;
t = t + s;
return s;
}
int main()
{
string name = “a”;
cout << fun(name);
cout << name;
}
- xxxxaaaa
- xxaa
- xa
- xxxaaa
Question 7: What is the output of the following snippet?
#include <iostream>
using namespace std;
int fun(long a, long b = 1)
{
return a << b;
}
int fun(int a, char b = ‘z’)
{
return b – a;
}
int fun(float a, float b = 0)
{
return a * b;
}
int main()
{
cout << fun(1L) << fun(‘x’) << fun(2e0f);
}
- 234
- 220
- 121
- 112
Question 8: What is the output of the following snippet?
#include <iostream>
#include <vector>
using namespace std;
int f1(int *a)
{
return *a + 1;
}
int *f2(int *a)
{
return a + 1;
}
int *f3(int &a)
{
return &a + 1;
}
int main()
{
vector<int> t = {0, 1, 2, 3};
cout << f1(f3(*f2(t.data())));
}
- 1
- 3
- 2
- 0
Question 9: What is the output of the following snippet?
#include <iostream>
using namespace std;
int fun(int a, int b)
{
return a + b;
}
int fun(int a, char b)
{
return b – a;
}
int fun(float a, float b)
{
return a * b;
}
int main()
{
cout << fun(1,0) << fun(‘a’,’c’) << fun(2.f,2.f);
}
- 481
- 124
- 248
- 012
Question 10: What is the output of the following snippet?
#include <iostream>
using namespace std;
int fun(int p1 = 1, int p2 = 1)
{
return p2 + p1;
}
int main()
{
cout << fun(fun(), fun(2));
}
- 5
- 3
- 8
- 4
Question 11: What is the output of the following snippet?
#include <iostream>
using namespace std;
float fun(float arg)
{
return arg * arg + arg + 1;
}
int main()
{
cout << fun(fun(1.0));
}
- 16
- 7
- 13
- 10
Question 12: What is the output of the following snippet?
#include <iostream>
#include <vector>
using namespace std;
int fun(int* t)
{
t[0] += t[1];
return t[0];
}
int main()
{
vector<int> t = { 5,6,7 };
cout << fun(&t[1]);
cout << t[0];
}
- 116
- 115
- 56
- 135
Question 13: What is the output of the following snippet?
using namespace std;
float Float(float x)
{
return 2 * x / (.5 * x);
}
void Void(int n)
{
float v = n;
v = Float(v);
cout << v;
}
int main()
{
Void(1);
}
- 10
- 8
- 6
- 4
Question 14: What is the output of the following snippet?
#include <iostream>
using namespace std;
int f1(int a)
{
return ++a;
}
int f2(int &a)
{
return ++a;
}
int f3(int *a)
{
return *a + 1;
}
int main()
{
int value = 2;
cout << f1(value);
cout << f2(value);
cout << f3(&value);
}
- 334
- 456
- 333
- 445
Question 15: What is the output of the following snippet?
#include <iostream>
using namespace std;
int main()
{
int *val = new int;
*val = sizeof(val) / sizeof(int *);
int *tab = new int[*val];
tab[0] = *val;
delete val;
cout << *tab;
delete [] tab;
}
- 0
- 1
- 2
- 4
Question 16: What is the output of the following snippet?
#include <iostream>
#include <string>
using namespace std;
string fun(string &t, string s = “”, int r = 1)
{
while(–r)
s += s;
t = t + s;
return s;
}
int main()
{
string name = “x”;
cout << fun(name, name);
cout << name;
}
- xx
- xxxx
- xxx
- x
Question 17: What is the output of the following snippet?
#include <iostream>
using namespace std;
int main()
{
float x = 3.14, *p = &x;
p[0] = ++x;
cout << x;
}
- 0.0
- 3.14
- 6.28
- 4.14
Question 18: What is the output of the following snippet?
#include <iostream>
#include <vector>
using namespace std;
int main()
{
vector<float> f(2);
float *p1 = f.data(), *p2 = p1 + 1;
cout << (p2 – p1) / sizeof(float);
}
- 3
- 0
- 1
- 2
Question 19: What is the output of the following snippet?
#include <iostream>
using namespace std;
int f1(int *a)
{
return *a;
}
int *f2(int *a)
{
return a;
}
int *f3(int &a)
{
return &a;
}
int main()
{
int value = 2;
cout << f1(f2(f3(value)));
}
- 3
- 1
- 0
- 2
Question 20: What is the output of the following snippet?
#include <iostream>
#include <vector>
using namespace std;
int main()
{
vector<int> tab = { 1, 2, 4 };
int *p1 = &tab[0], *p2 = p1 + 2;
tab[1] = p2[-1] + *p1;
cout << tab[1];
}
- 3
- 2
- 4
- 5
