C++ Mid Term
- 1.If a function needs to modify more than one variable, it must
- A.
Be pass by value
- B.
Be a void function
- C.
Return all values needed
- D.
Be a call by reference function
- 2.When a void function is called, it is known as
- A.
An output function.
- B.
A returned value.
- C.
An executable statement.
- D.
A comment
- 3.What is the output of the following code fragments? int trial( int& a, int b) { if(b > a) { a=b; return –a; } else { return 0; } } float x=0, y=10,z; z=trial(y,x); cout << z << " " << x <<" " << y << endl;
- A.
–10 0 0
- B.
0 1 0 0
- C.
1 0 0 0
- D.
0 0 1 0
- 4.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
- 5.Call-by-reference should be used
- A.
For all variables
- B.
When the function needs to change the value of one or more arguments
- C.
Never
- D.
Only in void functions
- 6.A simplified main program used to test functions is called
- A.
A stub
- B.
Abstraction
- C.
Polymorphism
- D.
A driver
- 7.When a variable is local to a function, we say that it has ___ of the function
- A.
Value
- B.
Constance
- C.
Scope
- D.
Locality
- 8.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.
- 9.If you write a function that should use call-by-reference, but forget to include the ampersand,
- A.
The program will not compile
- B.
The program will not link
- C.
The program will not run without a run-time error
- D.
The program will run but probably not give you the correct information.
- 10.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
- 11.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)
- 12.the fabs(double num) function
- A.
Returns the most fabulous number
- B.
Returns the largest whole number
- C.
Returns the negative value of num
- D.
Returns the absolute value of num
- 13.What is the output of the following program fragment? cout << static_cast<int>(3/4) << endl;
- A.
3
- B.
0.5
- C.
0
- D.
0.75
- 14.If you need to write a function that will compute the cost of some candy, where each piece costs 25 cents, which would be an appropriate function declaration?
- A.
Int calculateCost(char name);
- B.
Char calculateCost(int count);
- C.
Int calculateCost int count;
- D.
Int calculateCost(int count);
- 15.What is the value returned by the following function? int function() { int value = 35; return value + 5; value += 10; }
- A.
35
- B.
40
- C.
50
- D.
10
- 16.When overloading a function, what must be true?
- A.
The names should be different with the same number and/or types of parameters.
- B.
The names should be the same with different number and/or types of parameters.
- C.
The names should be different with different number and/or types of parameters.
- D.
The names should be the same with the same number and/or types of parameters.
- 17.When parameters are passed between the calling code and the called function, parameters and arguments are matched by:
- A.
Their data types
- B.
Their relative positions in the parameter and argument lists
- C.
Their names
- D.
They are not matched up at all.
- 18.The expression static_cast<int>(3) is called a
- A.
Type cast
- B.
Multiplier
- C.
Doubler
- D.
Polymorphism
- 19.If the variable x has the original value of 3.4, what is the value in x after the following? cout << static_cast<int>(x);
- A.
3.4
- B.
4
- C.
3
- D.
Unknown
- 20.What is the value of the following? sqrt(sqrt(pow(2,4)));
- A.
1
- B.
2
- C.
4
- D.
16
- 21.What is the value of i after the following function call? //function definition int doSomething(int value) { value = 35; return value; value = 13 } //fragment of main program int i=0; cout << doSomething(i);
- A.
13
- B.
35
- C.
48
- D.
0
- 22.What is the output of the following code fragement? double size, volume=16.0; size = sqrt(sqrt(volume)) / 3; cout << fixed << showpoint <precision(2);
- A.
0.67
- B.
0.6666667
- C.
0.00
- D.
0
- 23.Information Hiding is analogous to using
- A.
An algorithmic design
- B.
A black-box methodology
- C.
Actual parameters
- 24.What is the output of the following function call? //function body int factorial(int n) { int product=0; while(n > 0) { product = product * n; n—; } return product; } //function call cout << factorial(4);
- A.
4
- B.
0
- C.
24
- D.
48
- 25.Which of the following are equivalent to (!(x<15 && y>=3))?
- A.
(x>15 && y
- B.
(x>=15 && y < 3)
- C.
(x>=15 || y < 3)
- D.
(x>15 || y < 3)
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