C++ Ch 5 Quiz - Functions
C++ is a programming tool widely used today. If you are a programmer and you are looking for ways to better yourself in this field, then this quiz will do just that. All the best as you attempt the quiz.
- 1.A void function can return any value true or false?
- A.
True
- B.
False
- 2.The following is legal in a void function return; true or false?
- A.
True
- B.
False
- 3.In a function with call-by-reference parameters, any changes to the formal parameters will change the actual arguments passed to the function. true or false?
- A.
True
- B.
False
- 4.It is acceptable to have both call-by-value and call-by-reference parameters in the same function declaration. true or false?
- A.
True
- B.
False
- 5.A stub is a function that is completely defined and well tested true or false?
- A.
True
- B.
False
- 6.Which of the following is a legal call to the displayOutput function? void displayOutput(int total);
- A.
Void displayOutput(myTotal);
- B.
DisplayOutput(int mytotal);
- C.
DisplayOutput(myTotal);
- D.
Cout
- 7.The precondition(s) for a function describe
- A.
What is true after the function is executed
- B.
What the function does
- C.
How to call the function
- D.
What must be true before the function executes
- 8.Which of the following is true for a void function?
- A.
There cannot be a return statement.
- B.
The value of void should be returned.
- C.
The value of 0 should be returned.
- D.
Nothing is returned
- 9.What is the output of the following function and function call? void calculateCost(int count, float& subTotal, float& taxCost); float tax = 0.0, subTotal = 0.0; calculateCost(15, subTotal,tax); cout << "The cost for 15 items is " << subtotal << ", and the tax for " << subTotal << " is " << tax << endl; //end of fragment void calculateCost(int count, float& subTotal, float& taxCost) { if ( count < 10) { subTotal = count * 0.50; } else { subTotal = count * 0.20; } taxCost = 0.1 * subTotal; }
- A.
The cost for 15 items is 3.00, and the tax for 3.00 is 0.30;
- B.
The cost for 15 items is 0.00, and the tax for 3.00 is 0.00;
- C.
The cost for 15 items is 0.00, and the tax for 3.00 is 0.30;
- D.
The cost for 15 items is 3.00, and the tax for 3.00 is 0.00;
- 10.What is the output of the following function and function call? void calculateCost(int count, float& subTotal, float taxCost); float tax = 0.0, subtotal = 0.0; calculateCost(15, subtotal,tax); cout << "The cost for 15 items is " << subtotal << ", and the tax for " << subtotal << " is " << tax << endl; //end of fragment void calculateCost(int count, float& subTotal, float taxCost) { if ( count < 10) { subTotal = count * 0.50; } else { subTotal = count * 0.20; } taxCost = 0.1 * subTotal; }
- A.
The cost for 15 items is 3.00, and the tax for 3.00 is 0.30;
- B.
The cost for 15 items is 0.00, and the tax for 3.00 is 0.00;
- C.
The cost for 15 items is 0.00, and the tax for 3.00 is 0.30;
- D.
The cost for 15 items is 3.00, and the tax for 3.00 is 0.00;
- 11.Which of the following function prototypes are not valid?
- A.
Void doSomething(int& x, int y);
- B.
Void doSomething( int& x, int& y);
- C.
Void doSomething( int x, int y);
- D.
All are valid
- 12.What is the value of choice after the following statements? void getChoice(int& par_choice, in par_count); int choice, count=3; getChoice(choice, count); void getChoice(int& par_choice, in par_count) { if(par_count<0) par_choice =0; if(par_count = 0) par_choice=-1; else par_choice=99; return; }
- A.
3
- B.
0
- C.
-1
- D.
99
- 13.If you were to write a function for displaying the cost of an item to the screen, which function prototype would be most appropriate?
- A.
Void display();
- B.
Void display(float myCost);
- C.
Int display (float myCost);
- D.
Float display();
- 14.Given the function definition void something ( 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 something? (All variables are of type int.) r = 1; s = 2; t = 3; something(t, s); cout << r << ' ' << s << ' ' << t << endl;
- A.
1 14 3
- B.
1 10 3
- C.
5 14 3
- D.
1 14 9
- E.
None
- 15.Given the following function declaration and local variable declarations, which of the following is not a correct function call? int myInt; float myFloat; char ch; void someFunction(int& first, float second, char third);
- A.
SomeFunction(1, 2.0, ch);
- B.
SomeFunction(myInt, myFloat, ch);
- C.
SomeFunction(myInt, 2.0, 'c');
- D.
SomeFunction(myInt, myFloat, '1');
- 16.In the following function, what is passed to the first parameter? void f1( int& value1, int value2); int x,y; f1(x,y);
- A.
The value of x
- B.
Nothing, it is a void function
- C.
The value of y
- D.
The variable x (or its memory location)
- 17.A simplified main program used to test functions is called
- A.
A stub
- B.
Abstraction
- C.
Polymorphism
- D.
A driver
- 18.Which of the following comments would be the best post-condition for this swap function void swap( int& left, int&right);
- A.
//Postcondition: None
- B.
//Postcondition: the values of left and right are exchanged.
- C.
//Postcondition: left has the value of right
- D.
//Postcondition: left and right are unchanged
- 19.What is wrong with the following code? int f1( int x, int y) { x = y * y; return x; int f2( float a, float& b) { if(a < b) b = a; else a=b; return 0.0; } }
- A.
Neither function should return a value
- B.
Function definitions may not be nested
- C.
Both parameters to f2 should be pass-by reference
- D.
In f2, a can not be assigned b.
- E.
Nothing is wrong
- 20.Testing your program should be done
- A.
As each function is developed
- B.
At the end of the coding
- C.
Only if there appear to be problems
- D.
Only if your instructor requires it.
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