cs 124 test 1 practice

1. which of the following lines of c++ specifies that a library is to be used?

a. int main()
c. #include
b. using namespace std;
d. return 0;

2. every complete statement ends with a:

a. close curly brace }
c. semicolon ;
b. comma ,
d. period .

3. what does the line #include do in our programs?

a. prints text on the screen
c. nothing; it is just something that every program needs to have at the top of the file
b. tells the compiler to use the iostream library
d. accepts input from the user

4. how many main()s are there in the typical program?

a. exactly one.
c. none.
b. at least one.
d. more than one.

5. which takes up more space in memory?

a. uchar
c. int
b. char
d. short

6. which of the following sets the value 9,203.10 to the variable q?

a. float q = 9,203.10;
c. int q = 9,203.10;
b. int q = 9.2031e3;
d. float q = 9.2031e3;

7. which data type can hold a larger number?

a. float
c. int
b. char
d. real

8. what is a variable?

a. a pointer or address
c. all of the above
b. a named location where we store data
d. a constant value interchangable with a static number

9. select all that apply. floating point numbers are:

a. numbers with a decimal component
c. approximations, an inexact representation of a number
b. numbers with an unknown exponent
d. similar to real numbers

10. which is equivalent to the following statement? :
a = ++b * c;

a. a = 1 + (b * c);
c. b++; a = b * c;
b. a = (b + 1) * c;
d. a = b * c; b++;

11. which is equivalent to the following expression:
a = ! b == false & & c * 2

a. a = == false) & & (c * ;
b. a = ) == false) & & c) * 2);
c. a = == false)) & & (c * 2));
d. a = ) == false) & & (c * 2));

12. which is equivalent to the following expression:
a = b + c * d++ / 3;
a. a = (b + (c * ((d++) / ;
b. a = + c) * (d++)) / 3);
c. a = ((b + (c * (d++ / 3);
d. a = (b + ((c * (d++)) / 3));

13. what is the output of the following code fragment:
{
cout < < 8 + 12 * 2 - 4 < < endl;
}
a. 36
c. 28
b. 8
d. -40

14. what is the output of the following code fragment:
{
cout < < 3 - 15 / 2 < < endl;
}
a. -4
c. -4.5
b. 5
d. 2

15. what is the output of the following code fragment?
{
int x = 2;
int y = 3; ;
cout < < x + 2 / 6 + y < < endl;
}
a. 5
c. 0
b.
d. 5

16. what is the output?
{
int a = 386;
int b = (a / 10) % 10;
cout < < b < < endl;
}
a. 8
d. 86
b. 386
e. 3
c. 38
f. 6

17. what is the output of the following code fragment:
{
int i = 4 * 0.9;
int j = i * 2;
cout < < j < < endl;
}
a. 6
c. 7.2
b. 8
d. 0

18. what is the output of the following code fragment:
{
int x = 27;
cout < < x++ < < endl;
cout < < x++ < < endl;
}
a.
27
27
c.
28
28
b.
27
28
d.
28
29

19. which of the following moves the cursor to the next tab stop?
a. \t
c. /n
b. /t
d. \n

20. consider the following code:
cout < < "hello" < < endl;
which of the following does the same thing as endl in the above example?

a. '/n'
c. /n
b. \n
d. '\n'