CPA – Programming Essentials in C++ Summary Test Answers

CPA – Programming Essentials in C++ Summary Test Answers

Question 1: What is the value of the i variable?

float x = 1.0 / 5.0;

int i=x;

· 1

· 0.20

· 5.0

· 0

Question 2: What is the output of the following snippet?

#include <iostream>

#include <string>

using namespace std;

int main()

{

string s1 = “brick”;

string s2 = “block”;

string s;

s1.swap(s2);

s2.swap(s);

s.swap(s2);

cout << s1;

}

· block

· brick

· It prints an empty string

· Compilation fails

Question 3: What is the output of the following program if a digit 3 followed by Enter is entered through the keyboard?

#include <iostream>

using namespace std;

int main()

{

int i = 2, j = i++, k = i++;

cin >> i;

cout << k – i << j – i;

}

· 0-2

· -10

· 0-1

· -1-2

Question 4: What is printed on the screeen when the following code is run?

#include <iostream>

#include <vector>

using namespace std;

int main()

{

vector<double> arr = { 1e-1, 1e0, 1e1 };

double *ptr = arr.data() + 2;

cout << arr[1] – *ptr;

}

· -9

· 9

· 0.9

· -0.9

Question 5: What is the output of the following snippet?

#include <iostream>

#include <vector>

using namespace std;

int main()

{

vector<float *> ft = { new float[1], new float[1], new float[1] };

for(int i = 0; i < 3; i++) {

float *p = ft[i];

*p = i;

}

cout << *ft[1];

for(int i = 0; i < 3; i++) {

delete [] ft[i];

}

· 2

· Compilation fails

· 0

· 1

Question 6: What is the output of the following snippet?

#include <iostream>

#include <vector>

using namespace std;

void swap(float* x, float *y)

{

float z = *x;

*x = *y;

*y = z;

}

int main()

{

vector<float> t = { 3., 2., 1. };

swap(&t[0], &t[2]);

cout << t[1];

}

· 0

· 2

· 1

· 3

Question 7: What is the output of the following snippet?

#include <iostream>

using namespace std;

namespace Universe {

int Galaxy = 1;

}

namespace Universe {

int Planet = Galaxy + 2 ;

}

int main()

{

Universe::Galaxy *= 2;

{

using namespace Universe;

Planet++;

}

cout << Universe::Galaxy << Universe::Planet;

}

· 23

· 42

· 24

· complilation fails

Question 8: What is the value of the k variable?

int k = 2 % 3 + 5 % 3;

· 1

· 2

· 0

· 4

Question 9: Which of the following strings represent a legal integer literal?

(Select two answers.)

· -111222333

· x2FE

· b’11001111′

· 111’222’333

Question 10: What is the output of the following snippet?

#include <iostream>

using namespace std;

int op(int i, int j = 1)

{

return i * j;

}

int op(char a, char b)

{

return b – a;

}

int op(float x, float y)

{

return x / y;

}

int main()

{

cout << op(2) << op(‘c’, ‘a’) << op(4.f, 2.f);

}

· 222

· 2-22

· 01-2

· 2-48

Question 11: What is the output of the following snippet?

#include <iostream>

using namespace std;

int main()

{

bool b1 = !true;

bool b2 = !b1 && false;

bool b3 = b2 || true;

if(b3)

cout << “true”;

else

cout << “false” ;

}

· 0

· true

· 1

· false

Question 12: What is the final value of the k variable?

#include <iostream>

using namespace std;

int main()

{

int i = 0, k = i;

while(i == 0) {

if(k > 1)

i = k;

++k;

}

cout << k;

}

· 2

· 3

· 1

· 4

Question 13: Which of the following strings represent a legal floating point literal?

(Select two answers.)

· 1E-1

· 2.2f

· 1.2e1.2

· 2.2d

Question 14: What is printed on the screeen when the following code is run?

#include <iostream>

using namespace std;

int main()

{

int a = 2, b = a >> 1;

int c = b >> a;

int d = 1 << c;

int e = d << d;

cout << e;

}

· 4

· 2

· 0

· 1

Question 15: What is the output of the following snippet?

#include <iostream>

#include <vector>

using namespace std;

int main()

{

vector<char> text(5);

char *chr1 = text.data() + 2, *chr2 = chr1 + 2;

cout << chr2 – text.data();

}

· 3

· 2

· 4

· 1

Question 16: What is the output of the following snippet?

#include <iostream>

using namespace std;

int main()

{

int a = 2, b = a >> 1;

int c = a >> b;

int d = 1 << c;

int e = d >> d;

cout << e;

}

· 4

· 1

· 2

· 0

Question 17: What is printed on the screen when the following code is run?

#include <iostream>

using namespace std;

int main()

{

int i, k = 1;

for(i = 0; i < 3; i += 2)

k++;

cout << k;

}

· 4

· 2

· 3

· 1

Question 18: Which of the following strings represent a legal variable name?

(Select two answers.)

· my Variable 1

· 1myVariable

· myVariable1

· my_variable_1

Question 19: What is printed on the screen when the following code is run?

#include <iostream>

using namespace std;

int main()

{

int i = 1, k = i << 1;

switch(k) {

case 1: i += 1;

break;

case 2: i += 2;

break;

default: i += 3;

}

cout << i;

}

· 4

· 3

· 2

· 1

Question 20: What is the output of the following snippet?

#include <iostream>

using namespace std;

int main()

{

int i = 2;

float f = 1;

cout << (static_cast<float>(i) >> 1);

}

· 0

· 1

· 1.0

· compliation failed

Question 21: What is the output of the following snippet?

#include <iostream>

#include <string>

using namespace std;

int main()

{

string s = “123”;

s.append(s.substr(2)).push_back(s[s.length() – 2]);

cout << s;

}

· 12333

· Compilation fails

· 12312323

· 12233

Question 22: What is printed on the screen whent the following code is run?

#include <iostream>

#include <string>

using namespace std;

string replicate(string s = “x”, int r = 1)

{

string t;

while(r–)

t += s;

return t;

}

int main()

{

string pattern = “a”;

cout << replicate(pattern);

}

· x

· a

· ax

· xa

Question 23: What is printed on the screen when the following code is run?

#include <iostream>

using namespace std;

int main()

{

int k = 3;

if(k > 0) {

if(k != 3)

k–;

if(k == 3)

k++;

}

if(k < 0) {

k = 5;

}

cout << k;

}

· 4

· 5

· 2

· 3

Question 24: What is printed on the screen when the following code is run?

#include <iostream>

using namespace std;

int main()

{

int i = 1, k = i & 0;

do {

k++;

if(k > 1)

i = k;

} while(i < 2);

cout << k;

}

· 3

· 1

· 4

· 2

Question 25: What is the output of the following snippet?

#include <iostream>

#include <string>

using namespace std;

int main()

{

int i = 2;

string s = “2”;

cout << s == i;

}

· Compilation fails

· The program causes runtime error

· 1

· 0

Question 26: What is the output of the following snippet?

#include <iostream>

using namespace std;

float combine(float x1 = 0.0, int x2 = 1.0)

{

return x2 + x1;

}

int main()

{

cout << combine() + combine(1.) + combine(2., 3.);

}

· 4

· 2

· 3

· 8

Question 27: What is printed on the screen when the following program is run?

#include <iostream>

using namespace std;

int main()

{

int a = 0x02, b = 001;

int c = a ^ b;

int d = c | a;

int e = d & 0;

cout << e;

}

· 0

· 1

· 2

· 4

Question 28: What is the output of the following snippet?

#include <iostream>

using namespace std;

int main()

{

short s = 1;

int i = 2;

float f = 4.;

cout << i/static_cast<float>(s) + i/2 + i/f;

return 0;

}

· Compilation fails

· 3

· 4

· 3.5

Question 29: What is the output of the following snippet?

#include <iostream>

using namespace std;

double eval(double x)

{

return x / (.5 * x);

}

void use(double n)

{

int v = 1 / n;

v = eval(v);

cout << v;

}

int main()

{

use(1.f);

}

· 8

· 0

· 4

· 2

Question 30: What is the output of the following snippet?

#include <iostream>

using namespace std;

char do1(char *x)

{

return *x;

}

char *do2(char *y)

{

return y;

}

char *do3(char &z)

{

return &z;

}

int main()

{

char sign = ‘1’;

cout << do1(do2(do3(sign)));

}

· 1

· 2

· 0

· 4

CPA – Programming Essentials in C++ Summary Test Answers

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