C++ Multiple choice

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) 2 0 2

How many times will the following loop display "Hello"? for (int i = 0; i < 20; i++) cout << "Hello!" << endl; A) 20 B) 19 C) 21 D) An infinite number of times

A) 20

How many times will the following loop display "Hello"? for (int i = 20; i > 0; i--) cout << "Hello!" << endl; A) 20 B) 19 C) 21 D) An infinite number of times

A) 20

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) 4

What will the following code display? int number = 6; cout << number++ << endl; A) 6 B) 5 C) 7 D) 0

A) 6

What will the following code display? int number = 6; int x = 0; x = number--; cout << x << endl; A) 6 B) 5 C) 7 D) 0

A) 6

The while loop has two important parts: an expression that is tested for a true or false value, and: A) a statement or block that is repeated as long as the expression is true B) a statement or block that is repeated only if the expression is false C) one line of code that is repeated once, if the expression is true D) a statement or block that is repeated once, if the expression is true

A) a statement or block that is repeated as long as the expression is true

The statements in the body of a while loop may never be executed, whereas the statements in the body of a do-while loop will be executed: A) at least once B) at least twice C) as many times as the user wishes D) never E) None of these

A) at least once

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) call

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

A) definition

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) int

The name of an array stores the ________ of the first array element. A) memory address B) value C) element number D) data type E) None of these

A) memory address

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) persist

The do-while loop is a(n) ________ loop that is ideal in situations where you always want the loop to iterate at least once. A) post-test B) pre-test C) infinite D) null-terminated E) None of these

A) post-test

This operator increments the value of its operand, then uses the value in context. A) prefix increment B) postfix increment C) prefix decrement D) postfix decrement E) None of these

A) prefix increment

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) reference

A two-dimensional array can be viewed as ________ and ________. A) rows, columns B) arguments, parameters C) increments, decrements D) All of these E) None of these

A) rows, columns

An array can store a group of values, but the values must be: A) the same data type B) each of a different data type C) constants D) integers E) None of these

A) the same data type

A for statement contains three expressions: initialization, test, and A) update B) reversal C) null D) validation E) None of these

A) update

If you leave out the size declarator in an array definition: A) you must furnish an initialization list B) you are not required to initialize the array elements C) all array elements default to zero values D) your array will contain no elements

A) you must furnish an initialization list

These are operators that add and subtract one from their operands. A) plus and minus B) ++ and -- C) binary and unary D) conditional and relational E) None of these

B) ++ and --

What will the following loop display? int x = 0; while (x < 5) { cout << x << endl; x++; } A) 0 1 2 3 4 5 B) 0 1 2 3 4 C) 01 2 3 4 D) The loop will display numbers starting at 0, for infinity.

B) 0 1 2 3 4

What is the output of the following code segment? n = 1; for ( ; n <= 5; ) cout << n << ' '; n++; A) 1 2 3 4 5 B) 1 1 1 ... and on forever C) 2 3 4 5 6 D) 1 2 3 4 E) 2 3 4 5

B) 1 1 1 ... and on forever

What is the output of the following code segment? n = 1; while (n <= 5) cout << n << ' '; n++; A) 1 2 3 4 5 B) 1 1 1... and on forever C) 2 3 4 5 6 D) 1 2 3 4 E) 2 3 4 5

B) 1 1 1... and on forever

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) 1 6 3

How many times will the following loop display "Hello"? for (int i = 1; i < 20; i++) cout << "Hello!" << endl; A) 20 B) 19 C) 21 D) An infinite number of times

B) 19

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) 4 2

What will the following code display? int number = 6 int x = 0; x = --number; cout << x << endl; A) 6 B) 5 C) 7 D) 0

B) 5

Look at the following statement. while (x++ < 10) Which operator is used first? A) ++ B) < C) Neither. The expression is invalid.

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) Default

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) EXIT_SUCCESS

________ 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) Two or more

When writing functions that accept multi-dimensional arrays as arguments, ________ must be explicitly stated in the parameter list. A) all dimensions B) all but the first dimension C) the size declarator of the first dimension D) all element values E) None of these

B) all but the first dimension

This statement causes a loop to terminate early. A) stop B) break C) null D) terminate E) None of these

B) break

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) computeValue(10);

This is a variable that is regularly incremented or decremented each time a loop iterates. A) constant B) counter C) control statement D) null terminator E) None of these

B) counter

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) document

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) double

The individual values contained in array are known as ________. A) parts B) elements C) numbers D) constants E) None of these

B) elements

If you want a user to enter exactly 20 values, which loop would be the best to use? A) do-while B) for C) while D) infinite E) None of these

B) for

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

B) global

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) header

To read data from a file, you define an object of this data type. A) inputFile B) ifstream C) fstream D) ofstream

B) ifstream

This means to increase a value by one. A) decrement B) increment C) modulus D) parse E) None of these

B) increment

Something within a while loop must eventually cause the condition to become false, or a(n) ________ results. A) null value B) infinite loop C) unexpected exit D) compiler error E) None of these

B) infinite loop

The while loop contains an expression that is tested for a true or false value, and a statement or block that is repeated as long as the expression: A) is false B) is true C) does not evaluate to true or false D) evaluates to true or false E) None of these

B) is true

) A file must be ________ before data can be written to or read from it. A) closed B) opened C) buffered D) initialized E) None of these

B) opened

The do-while loop is considered a(n) ________ loop. A) pre-test B) post-test C) infinite D) limited E) None of these

B) post-test

The while loop is this type of loop. A) post-test B) pre-test C) infinite D) limited E) None of these

B) pre-test

When the increment operator precedes its operand, as in ++num1, the expression is in this mode. A) postfix B) prefix C) preliminary D) binary E) None of these

B) prefix

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) prototype

A two-dimensional array is like ________ put together. A) an array and a function B) several identical arrays C) two functions D) two arrays of different types E) None of these

B) several identical arrays

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) stub

To access an array element, use the array name and the element's ________. A) data type B) subscript C) name D) value E) None of these

B) subscript

An element of a two-dimensional array is referred to by ________ followed by ________. A) the array name, the column number of element B) the row subscript of the element, the column subscript of the element C) a comma, a semicolon D) the row subscript of element, the array name E) None of these

B) the row subscript of the element, the column subscript of the element

This is a pre-test loop that is ideal in situations where you do not want the loop to iterate if the condition is false from the beginning. A) do-while B) while C) for D) infinite E) None of these

B) while

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) 10

How many times will the following loop display "Hello"? for (int i = 0; i <= 20; i++) cout << "Hello!" << endl; A) 20 B) 19 C) 21 D) An infinite number of times

C) 21

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) 3

What will the following code display? int number = 6; cout << ++number << endl; A) 6 B) 5 C) 7 D) 0

C) 7

What will the following code display? int number = 6; ++number; cout << number << endl; A) 6 B) 5 C) 7 D) 0

C) 7

What will the following code display? int number = 6; number++; cout << number << endl; A) 6 B) 5 C) 7 D) 0

C) 7

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 global variable can have the same name as a variable that is declared locally within a function.

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) argument, parameter

Unlike regular variables, these can hold multiple values. A) constants B) named constants C) arrays D) floating-point variables E) None of these

C) arrays

) A file ________ is a small holding section of memory that file-bound information is first written to. A) name B) number C) buffer D) segment E) None of these

C) buffer

Assuming dataFile is a file stream object, the statement: dataFile.close(); A) is illegal in C++ B) needs a filename argument to execute correctly C) closes a file D) is legal but risks losing valuable data E) None of these

C) closes a file

An array's size declarator must be a ________ with a value greater than ________. A) number, one B) number, zero C) constant integer expression, zero D) variable, -1 E) None of these

C) constant integer expression, zero

This loop is a good choice when you know how many times you want the loop to iterate in advance of entering the loop. A) do-while B) while C) for D) infinite E) None of these

C) for

To allow file access in a program, you must #include this header file. A) file B) fileaccess C) fstream D) cfile

C) fstream

In a for statement, this expression is executed only once. A) test B) null C) initialization D) validation E) None of these

C) initialization

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) local

This is a control structure that causes a statement or group of statements to repeat. A) decision statement B) constant C) loop D) cout object E) None of these

C) loop

If you place a semicolon after the test expression in a while loop, it is assumed to be a(n): A) pre-test loop B) post-test loop C) null statement D) infinite loop E) None of these

C) null statement

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) only one

Assuming outFile is a file stream object and number is a variable, which statement writes the contents of number to the file associated with outFile? A) write(outFile, number); B) outFile >> number; C) outFile << number; D) number >> outFile;

C) outFile << number;

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

C) return

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) static

By using the same ________ you can build relationships between data stored in two or more arrays. A) array name B) data C) subscript D) arguments E) None of these

C) subscript

You may define a ________ in the initialization expression of a for loop. A) constant B) function C) variable D) new data type E) None of these

C) variable

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) 15

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) 2 0 0

What will the following code display? int x = 0; for (int count = 0; count < 3; count++) x += count; cout << x << endl; A) 0 1 2 B) 0 C) 6 D) 3

D) 3

A loop that is inside another loop is called: A) an infinite loop B) a pre-test loop C) a post-test loop D) a nested loop E) None of these

D) a nested loop

Subscript numbering in C++________. A) can be set at runtime B) can begin with a programmer-defined value C) varies from program to program D) begins with zero E) None of these

D) begins with zero

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

D) called

This statement may be used to stop a loop's current iteration and begin the next one. A) break B) terminate C) re-iterate D) continue E) None of these

D) continue

This statement may be used to stop a loop's current iteration and begin the next one. A) break B) terminate C) return D) continue E) None of these

D) continue

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) default

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) exit()

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) function

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) function call

The statement: int grades[ ] = { 100, 90, 99, 80}; shows an example of: A) default arguments B) an illegal array declaration C) an illegal array initialization D) implicit array sizing E) None of these

D) implicit array sizing

Which of the following is a valid C++ array definition? A) int array[0]; B) float $payments[10]; C) void numbers[5]; D) int array[10]; E) None of these

D) int array[10];

Which of the following is a valid C++ array definition? A) int scores[0]; B) float $payments[10]; C) int readings[4.5]; D) int scores [10]; E) None of these

D) int scores [10];

To write data to a file, you define an object of this data type. A) outputFile B) ifstream C) fstream D) ofstream

D) ofstream

This is a special value that marks the end of a list of values. A) constant B) variable C) loop D) sentinel E) None of these

D) sentinel

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

D) static local

This may be used to write information to a file. A) cout object B) pen object C) output object D) stream insertion operator E) None of these

D) stream insertion operator

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) All of these