Chapter 6 Functions

What is the output of the following program? #include <iostream> using namespace std; void doSomething(int); int main() { int x = 2; cout << x << endl; doSomething(x); cout << x << endl; return 0; } void doSomething(int num) { num = 0; cout << num << endl; } A) 2 0 2 B) 2 2 2 C) 0 0 0 D) 2 0 0

A

When used as parameters, these types of variables allow a function to access the parameter's original argument. A) reference B) floating-point C) counter D) undeclared E) None of these

A

Which line in the following program contains the prototype for the showDub function? 1 #include <iostream> 2 using namespace std; 3 4 void showDub(int); 5 6 int main() 7 { 8 int x = 2; 9 10 showDub(x); 11 cout << x << endl; 12 return 0; 13 } 14 15 void showDub(int num) 16 { 17 cout << (num * 2) << endl; 18 } A) 4 B) 6 C) 10 D) 15

A

A function ________ eliminates the need to place a function definition before all calls to the function. A) header B) prototype C) argument D) parameter E) None of these

B

Given the following function definition: void calc (int a, int& b) { int c; c = a + 2; a = a * 3; b = c + a; } What is the output of the following code fragment that invokes calc? int x = 1; int y = 2; int z = 3; calc(x, y); cout << x << " " << y << " " << z << endl; A) 1 2 3 B) 1 6 3 C) 3 6 3 D) 1 14 9 E) None of these

B

Here is the header for a function named computeValue: void computeValue(int value) Which of the following is a valid call to the function? A) computeValue(10) B) computeValue(10); C) void computeValue(10); D) void computeValue(int x);

B

It is a good programming practice to ________ your functions by writing comments that describe what they do. A) execute B) document C) eliminate D) prototype E) None of these

B

Look at the following function prototype. int myFunction(double); What is the data type of the function's parameter variable? A) int B) double C) void D) Can't tell from the prototype

B

These types of arguments are passed to parameters automatically if no argument is provided in the function call. A) Local B) Default C) Global D) Relational E) None of these

B

This is a dummy function that is called instead of the actual function it represents. A) main function B) stub C) driver D) overloaded function

B

What is the output of the following program? #include <iostream> using namespace std; void showDub(int); int main() { int x = 2; showDub(x); cout << x << endl; return 0; } void showDub(int num) { cout << (num * 2) << endl; } A) 2 2 B) 4 2 C) 2 4 D) 4 4

B

A(n) ________ is information that is passed to a function, and a(n) ________ is information that is received by a function. A) function call, function header B) parameter, argument C) argument, parameter D) prototype, header E) None of these

C

Look at the following function prototype. int myFunction(double, double, double); How many parameter variables does this function have? A) 1 B) 2 C) 3 D) Can't tell from the prototype

C

The value in this type of local variable persists between function calls. A) global B) internal C) static D) dynamic E) None of these

C

This statement causes a function to end. A) end B) terminate C) return D) release E) None of these

C

Which line in the following program contains a call to the showDub function? 1 #include <iostream> 2 using namespace std; 3 4 void showDub(int); 5 6 int main() 7 { 8 int x = 2; 9 10 showDub(x); 11 cout << x << endl; 12 return 0; 13 } 14 15 void showDub(int num) 16 { 17 cout << (num * 2) << endl; 18 } A) 4 B) 6 C) 10 D) 15

C

This is a statement that causes a function to execute. A) for loop B) do-while loop C) function prototype D) function call E) None of these

D

What is the output of the following program? #include <iostream> using namespace std; void doSomething(int&); int main() { int x = 2; cout << x << endl; doSomething(x); cout << x << endl; return 0; } void doSomething(int& num) { num = 0; cout << num << endl; } A) 2 0 2 B) 2 2 2 C) 0 0 0 D) 2 0 0

D

Which line in the following program contains the header for the showDub function? 1 #include <iostream> 2 using namespace std; 3 4 void showDub(int); 5 6 int main() 7 { 8 int x = 2; 9 10 showDub(x); 11 cout << x << endl; 12 return 0; 13 } 14 15 void showDub(int num) 16 { 17 cout << (num * 2) << endl; 18 } A) 4 B) 6 C) 10 D) 15

D

Functions are ideal for use in menu-driven programs. When a user selects a menu item, the program can ________ the appropriate function. A) call B) prototype C) define D) declare E) None of these

A

If a function is called more than once in a program, the values stored in the function's local variables do not ________ between function calls. A) persist B) execute C) communicate D) change E) None of these

A

Look at the following function prototype. int myFunction(double); What is the data type of the function's return value? A) int B) double C) void D) Can't tell from the prototype

A

A ________ variable is declared outside all functions. A) local B) global C) floating-point D) counter E) None of these

B

If a function does not have a prototype, default arguments may be specified in the function ________. A) call B) header C) execution D) return type E) None of these

B

This type of variable is defined inside a function and is not accessible outside the function. A) global B) reference C) local D) counter E) None of these

C

Which of the following statements about global variables is true? A) A global variable is accessible only to the main function. B) A global variable is declared in the highest-level block in which it is used. C) A global variable can have the same name as a variable that is declared locally within a function. D) If a function contains a local variable with the same name as a global variable, the global variable's name takes precedence within the function. E) All of these are true.

C

A ________ argument is passed to a parameter when the actual argument is left out of the function call. A) false B) true C) null D) default E) None of these

D

A function is executed when it is: A) defined B) prototyped C) declared D) called E) None of these

D

The value in a ________ variable persists between function calls. A) dynamic B) local C) counter D) static local

D

This function causes a program to terminate, regardless of which function or control mechanism is executing. A) terminate() B) return() C) continue() D) exit() E) None of these

D

This is a collection of statements that performs a specific task. A) infinite loop B) variable C) constant D) function E) None of these

D

In a function header, you must furnish: A) data type(s) of the parameters B) data type of the return value C) the name of function D) names of parameter variables E) All of these

E

A function ________ contains the statements that make up the function. A) definition B) prototype C) call D) expression E) parameter list

A

EXIT_FAILURE and ________ are named constants that may be used to indicate success or failure when the exit() function is called. A) EXIT_TERMINATE B) EXIT_SUCCESS C) EXIT_OK D) RETURN_OK E) None of these

B

________ functions may have the same name, as long as their parameter lists are different. A) Only two B) Two or more C) Zero D) Un-prototyped E) None of these

B

A function can have zero to many parameters, and it can return this many values. A) zero to many B) no C) only one D) a maximum of ten E) None of these

C

What is the output of the following program? #include <iostream> using namespace std; int getValue(int); int main() { int x = 2; cout << getValue(x) << endl; return 0; } int getValue(int num) { return num + 5; } A) 5 B) 2 C) 7 D) "getValue(x)"

C