CS124 PRATCTICE

21. Which fragment of code accepts a user's address (such as "1600 Pennsylvania Avenue")?

a. char address;
cin >> address;
c. char address[256];
cin.getline(address, 256);
b.char address;
cin.getline(address);
d. char address[256];
cin >> address;

22. What is the value of a after the following code is executed:
{
bool a = (3 == 'A');
}
a. true
b. false


23. What is the value of b after the following code is executed:
{
bool a = !(true);
bool b = !(true && false) && a;
}
a. true
b. false


24. What is the value of e after the following code is executed:
{
bool a = (10 < 10);
bool b = !a;
bool c = a || b;
bool d = c && (b || a);
bool e = d && d;
}
a. True
b. False


25. What is the value of a after the following code is executed:
{
bool a = 42;
}
a. True
c. Undefined
b. False
d. Syntax error


26. What is the output:
{
char a = 'a';

if (a = 'b')
a = 'c';
else
a = 'd';

cout << a << endl;
}
a. a
b. b
c. c
d. d


27. Which of the following fragments of code will determine whether I have passed a class?

a. bool pass = (grade => 60);
b. bool pass = false;
if (grade < 60)
pass = true;
c. bool pass = (!(grade < 60));
d. bool pass = true;
if (grade = 60)
pass = false;


28. What is the output:
{
int z = 3;

if (z = 4);
cout << "Error";
cout << z << endl;
}
a. Error
b. 3
c.
d. Error 4


29. What is the output?
void a()
{
cout << 6;
return;
}

int main()
{
cout << 3;
a();
cout << 9;

return 0;
}
a. 39
b. 6
c. 369
d. 639


30. What is the output of the following program:
void subtract(int b, int a)
{
cout << a - b << endl;
return;
}

int main()
{
int a = 16;
int b = 12;
subtract(a, b);
return 0;
}
a. 12
c. 16
b. 4
d. -4


31. What is the output?
int two()
{
return 6;
}

int main()
{
int one = 10;
int three = two() + one;

cout << three << endl;

return 0;
}
a. 6
b. 10
c. 3
d. 16


32. What is the output?
double z(double b double c)
{
return b - c;
}

int main()
{
cout << z(20.6 10.2) << endl;
return 0;
}
a. 30.8
b. 10.4
c. compile error
d. z(20.6, 10.2)


33. What is the output of the following program:
double z(double a1, double a2)
{
return a1 + a2;
}

int main()
{
double a = z(2, 4);
double b = z(a, z(11, 11));

cout << b << endl;
return 0;
}
a. 22
c. 28
b. 6
d. 11


34. What is the output of the following program:
int setSeven(int value)
{
value = 7;
return value;
}

int main()
{
int value = 6;

setSeven(value);

cout << value << endl;
return 0;
}
a. value
c. 6
b.
d. 7


35. What is the output of the following program:
void function(int x, int &y)
{
x = 0;
y = 0;
return;
}

int main()
{
int m = 2;
int n = 6;

function(m, n);

cout << "m == " << m << endl
<< "n == " << n << endl;

return 0;
}
a. m == 2
n == 6
c. m == 2
n == 0
b. m == 0
n == 0
d. m == 0
n == 6


36. Which best describes a computer bus?

a. A device that outputs data to the user or accepts input from the user
c. A chip that moves data from one part of the computer to another
b. The data connection between main memory and the CPU
d. The data connection between the components of a computer

37. If your body was a computer, select all the von Neumann functions that the spinal cord would perform.

a. Bus
c. Memory
b. I/O
d. CPU


38. A digital wrist watch is a computer. Which Von Neumann component is the display?

a. Memory
c. Bus
b. CPU
d. I/O


39. Which part of a compiler breaks a program up into words or tokens?

a. Parser
c. Linker
b. Lexer
d. Code generator


40. 3 Byte(s) equals

a. 3 bits
d. 12 bits
b. 96 bits
e. 6 bits
c. 24 bits