QUESTION 39

Suppose that the values of two integer variables in main, x and y, are to be swapped by calling a swap function which returns no value.

What could the prototype for the swap function look like?

	a.	void swap( int &, int & );
	b.	void swap( int, int );
	c.	void swap()

1 points

QUESTION 40

I want to call a function, and have it pass back two calculations. What will I need?

	a.	An object.
	b.	A structure.
	c.	A constructor.
	d.	At least one reference.

1 points

QUESTION 41

void testfn( double &, double & ); //is a prototype for a function.

Which of the following is a valid calling statement for the function testfn, assuming that var1 and var2 are double variables?

	a.	testfn( *var1, *var2 );
	b.	testfn( var1, var2 );
	c.	testfn( &var1, &var2 );

1 points

QUESTION 42

str1

c

a

t

\0

str2

d

o

g

\0

Using the two strings above, what will the following code display?

if( strcmp( str1, str2) == 0 ) cout << str1 << " is equal to " << str2; else if ( strcmp( str1, str2) < 0 ) cout << str1 << " is less than " << str2; else cout << str1 << " is greater than " << str2;

	a.	cat is equal to dog
	b.	cat is less than dog
	c.	cat is greater than dog

1 points

QUESTION 43

If a c string will need room to hold a maximum of 80 characters, how should it be defined so that it will be treated as a VALID string?

	a.	char ar[];
	b.	char ar[81];
	c.	char ar[80];
	d.	char ar[79];

1 points

QUESTION 44

strcat(string1, string2); //places a null terminated copy of string2 into the middle of string1

	a.	true
	b.	false

1 points

QUESTION 45

The strlen function returns the _________.

	a.	number of characters in a string, not including the null terminator
	b.	number of characters in a string, including the null terminator

1 points

QUESTION 46

Which was used first from the list below in the history of C and C++ language?

		string class
		string method substring
		character arrays (c strings)
		string constructor