Practice COSC

1. The standard header file for the abs(x)function is ____.
a.< cmath > b.< ioinput >
c.< cctype >d.< cstdlib >

1. ANS: D < cstdlib > 1

2. To use the predefined function tolower, the program must include the header file ____.

a. cctype b. iostream
c. cmath d. cstdlib

a. cctype

3. The output of the statement

cout &lt;&lt; tolower(‘$’) &lt;&lt; endl; is ____.

a. ‘$’ b. ‘0’ c. ‘1’
d. An error, because you cannot use tolower with ‘$’.

a. ‘$’

4. Assume the following.

static_cast(‘a’) = 97 static_cast(‘A’) = 65

The output of the statement:

cout &lt;&lt; static_cast(tolower(‘B’)) &lt;&lt; endl; is ____.

a. 65 b. 67 c. 96 d. 98

d. 98

5. The output of the statement:
cout &lt;&lt; pow(3.0, 2.0) + 5 &lt;&lt; endl; is ____.

a. 11.0 b. 12.0 c. 13.0 d. 14.0

d. 14.0

6. The output of the statement:

cout &lt;&lt; pow(2.0, pow(3.0, 1.0)) &lt;&lt; endl; is ____.

a. 6.0 b. 7.0 c. 8.0 d. 9.0

c. 8.0

7. Functions that do not have a return type are called ____ functions.

a. zero b. null c. void d. empty

c. void

8. The heading of the function is also called the ____.

a. title b. function signature
c. function head d. function header

d. function header

9. Given the following function prototype:
int test(float, char);
which of the following statements is valid?
a. cout &lt;&lt; test(12, &amp;);
b. cout &lt;&lt; test("12.0", ‘&amp;’);
c. int u = test(5.0, ‘*’);
d. cout &lt;&lt; test(’12’, ‘&amp;’);

c. int u = test(5.0, ‘*’);

10. A variable or expression listed in a call to a function is called the ____.

a. formal parameter b. actual parameter
c. data type d. type of the function

b. actual parameter

A variable listed in a function call is known as a(n) ____ parameter. A variable list in a header is known as a(n) ____ parameter.

a. actual; actual
b. formal; formal
c. actual; formal
d. formal; actual

c. actual; formal

What value is returned by the following return statement?
int x = 5;
return x + 1;

a. 0 b. 5 c. 6 d. 7

c. 6

13. Given the following function
int strange(int x, int y)
{
if (x &gt; y)
return x + y;
else return x – y;
}
what is the output of the following statement:?
cout &lt;&lt; strange(4, 5) &lt;&lt; endl;

a. -1 b. 1 c. 9 d. 20

a. -1

Given the following function
int next(int x)
{
return (x + 1);
}
what is the output of the following statement?
cout &lt;&lt; next(next(5)) &lt;&lt; endl;

a. 5 b. 6 c. 7 d. 8

c. 7

Which statement below about prototypes and headers is true?

a. Parameter names must be listed in the prototype, but not necessarily in the header.
b. Prototypes end with a semicolon, but headers do not.
c. Headers should come before prototypes.
d. Headers end with a semicolon, but prototypes do not.

b. Prototypes end with a semicolon, but headers do not

A function prototype is ____.

a. a definition, but not a declaration
b. a declaration and a definition
c. a declaration, but not a definition
d. a comment line

c. a declaration, but not a definition

Given the function prototype:
float test(int, int, int);
which of the following statements is legal?

a. cout &lt;&lt; test(7, test(14, 23));
b. cout &lt;&lt; test(test(7, 14), 23);
c. cout &lt;&lt; test(14, 23);
d. cout &lt;&lt; test(7, 14, 23);

d. cout << test(7, 14, 23);

Given the following function prototype:
double tryMe(double, double);,
which of the following statements is valid? Assume that all variables are properly declared.

a. cin &gt;&gt; tryMe(x);
b. cout &lt;&lt; tryMe(2.0, 3.0);
c. cout &lt;&lt; tryMe(tryMe(double, double), double);
d. cout &lt;&lt; tryMe(tryMe(float, float), float);

b. cout << tryMe(2.0, 3.0);

Given the function prototype:
double testAlpha(int u, char v, double t);
which of the following statements is legal?

a. cout &lt;&lt; testAlpha(5, ‘A’, 2);
b. cout &lt;&lt; testAlpha( int 5, char ‘A’, int 2);
c. cout &lt;&lt; testAlpha(‘5.0’, ‘A’, ‘2.0’);
d. cout &lt;&lt; testAlpha(5.0, "65", 2.0);

a. cout << testAlpha(5, ‘A’, 2);

Which of the following function prototypes is valid?

a. int funcTest(int x, int y, float z){}
b. funcTest(int x, int y, float){};
c. int funcTest(int, int y, float z)
d. int funcTest(int, int, float);

d. int funcTest(int, int, float);

Which of the following function prototypes is valid?
a. int funcExp(int x, float v);
b. funcExp(int x, float v){};
c. funcExp(void);
d. int funcExp(x);

a. int funcExp(int x, float v);

Given the following function prototype:
int myFunc(int, int);
which of the following statements is valid? Assume that all variables are properly declared.
a. cin &gt;&gt; myFunc(y);
b. cout &lt;&lt; myFunc(myFunc(7, 8), 15);
c. cin &gt;&gt; myFunc(‘2’, ‘3’);
d. cout &lt;&lt; myFunc(myFunc(7), 15);

b. cout << myFunc(myFunc(7, 8), 15);

The statement:
return 8, 10;
returns the value ____.

a. 8 b. 10 c. 18 d. 80

b. 10

The statement:
return 37, y, 2 * 3;
returns the value ____.

a. 2 b. 3 c. y d. 6

d. 6

The statement: return 2 * 3 + 1, 1 + 5; returns the value ____.

a. 2 b. 3 c. 6 d. 7

c. 6

Suppose that printHeading is a function without any parameters. Which of the following is a valid function heading?

a. void printHeading();
b. void printHeading()
c. void printHeading(noParameters);
d. void printHeading(void)

b. void printHeading()

Which of the following is a legal C++ function definition?

a. void funcTest(int&amp; u, double&amp; v)
{
cout &lt;&lt; u &lt;&lt; " " &lt;&lt; v &lt;&lt; endl;
}
b. void funcTest(int&amp; u, double&amp; v);
{
cout &lt;&lt; u &lt;&lt; " " &lt;&lt; v &lt;&lt; endl;
}
c. void funcTest(int&amp; u, double&amp; v)
(
cout &lt;&lt; u &lt;&lt; " " &lt;&lt; v &lt;&lt; endl
)
d. void funcTest(int&amp; u, double&amp; v)
[
cout &lt;&lt; u &lt;&lt; " " &lt;&lt; v &lt;&lt; endl;
]

a. void funcTest(int& u, double& v) { cout << u << " " << v << endl; }

There are two types of ____ parameters: value parameters and reference parameters.

a. actual b. formal
c. active d. passive

b. formal

If an &amp; is attached after the data type of a formal parameter, then the formal parameter is a ____.

a. value parameter
b. reference parameter
c. global variable
d. default variable

b. reference parameter

A void function accomplish has three parameters: a parameter u of type int, a parameter v of type double, and a parameter letter of type char. The parameters u and letter need to pass their values out of the function and the parameter v is to only receive the value from the calling environment. Which of the following is a correct function heading?
a. void accomplish(int&amp; u, double v, char&amp; letter)
b. void accomplish(int u, double&amp; v, char letter)
c. void accomplish(int&amp; u, double v, char&amp; letter);

a. void accomplish(int& u, double v, char& letter)