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 = < 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