High-Level Programming Test Questions & Answers 2022

High-Level Programming Test Numeric Grade: 132 / 150 pts 1. Question : (TCO 2) If firstName and lastName are string object variables, which statement can be used to combine (append or concatenate) the two into a single string variable? Student Answer: fullName = firstName + lastName; fullName = firstName, lastName; fullName = firstName & lastName; fullName = firstName && lastName; Comments: Question 2 . Question : (TCO 2) What is the value of i after the following code fragment executes? int i = 2; int k = 5 ; i *= k + 1; Student Answer: 7 11 12 14 Comments: Question 3 . Question : (TCO 2) C++ selection statements include: Student Answer: for, while, do-while cout and cin if, if-else, if-else if, switch #include iostream and using namespace std; Comments: Question 4 . Question : (TCO 2) Which of the following is not a C++ logical operator? Student Answer: # && „„ ! Comments: Question 5 . Question : (TCO 2) What is the result of 5 % 7? Student Answer: 0 2 5 7 Comments: Question 6 . Question : (TCO 2) Given the following code to fill an array, int X; int data[100]; for(int i = 0; i = X; i++) data[i] = i; What should the value of X be? Student Answer: 100 101 99 i Comments: Question 7 . Question : (TCO 2) Which type of error does the following code fragment cause? const int MAX = 500; int main (void) { int foo [MAX]; for (int i = 0; i = MAX; i++) { foo [i] = i * 2; } Student Answer: Compiler, due to out-of-bounds array subscript. Run-time, due to out-of-bounds array subscript. Compiler, due to invalid array initialization. None of the above. It does not create any type of error. Comments: Question 8 . Question : (TCO 2) Given the following code fragment, what is the data type of roster[9] .name? struct student { string name; double gpa; }; student thisStudent; student roster[50]; Student Answer: string const pointer to student student double Comments: Question 9 . Question : (TCO 2) Which of the following function definitions uses pass-byvalues? Student Answer: int myFunc( int * x, int * y ); int myFunc( int x, int y ) ; int myFunc( int & x, int & y ) ; int myFunc( int @value1, int @value2 ) ; Comments: Question 10 . Question : (TCO 2) Which of the following statements calls the following function correctly? int MultiplyValues (int, int); Student Answer: int a = MultiplyValues (int x, int y); int a = MultiplyValues (10, 20); double d = MultiplyValues (int 10, int 20); All of the above Comments: Question 11.Question : (TCO 2) What is the output of the following code? void func(int x) { x = x * 2; } int main( ) { int x = 10; func(x); cout x endl; } Student Answer: 20 30 10 5 1. Question : (TCO 2) Composition is typically an example of: Student Answer: a “has a” relationship an “is a” relationship a “uses a” relationship an “is used” relationship Comments: Question 2 . Question : (TCO 2) Creating classes with private data members is an example of: Student Answer: encapsulation polymorphism inheritance abstraction Comments: Question 3 . Question : (TCO 2) Which of the following is called automatically each time an object is created? Student Answer: Compiler Builder Constructor Destructor Comments: Question 4 . Question : (TCO 2) When organizing a program into three files (main, class implementation, and class header), which is not a .cpp file? Student Answer: main none are .cpp class header class implementation Comments: Question 5 . Question : (TCO 2) Given the following class definition and lines of code, what, if anything, is wrong with Line 6 in main? class Distance { private: int feet; double inches; public: Distance( ); Distance(int initFt, double initIn); void setFeet(int feetIn); void setInches(double inchesIn); int getFeet() const; double getInches( ) const; }; int main( ) { Distance d1; //Line 1 const int MAX = 100; //Line 2 Distance list [MAX]; //Line 3 Distance d2(1, 2.3); //Line 4 Distance * pDist; //Line 5 = 5; //Line 6 // etc. – assume the remaining code is correct } Student Answer: It will not compile because feet is private and cannot be directly accessed. Distance d1; should be changed to int d1; :: = 5; should be changed to d1(feet) = 5; It will compile, but causes a run-time error because has not been declared. Comments: Question 6 . Question : (TCO 2) Given the following definitions, select the statement which is illegal. int * iptr; double * dptr; int j = 10; double d = 10.0; Student Answer: iptr = &j; dptr = &d; iptr = 0; dptr = &j; Comments: Question 7 . Question : (TCO 2) What is the output of the following code snippet? int value = 10; int * iptr = &value; *iptr = 5; Cout *iptr “ “ value; Student Answer: 5 5 10 10 5 10 10 5 Comments: Question 8 . Question : (TCO 2) What is the output of the following code snippet? int *list = new int[5]; int *ptr; for (int i = 0; i 5; i ++) list [i] = i + 1; ptr = list; delete [ ] list; cout *ptr; Student Answer: 1 address of list address of ptr error – ptr references memory which no longer belongs to the program Comments: Question 9 . Question : (TCO 2) The Graphics class in Java provides methods to: Student Answer: draw lines between any two points draw test strings starting at any point draw shapes such as rectangles, ovals, etc. All of the above Comments: Question 10 . Question : (TCO 2) In order to guarantee that only one JRadioButton is selected at any time: Student Answer: add each JRadioButton object to a different panel create a ButtonGroup object and add the JRadioBttons to it have a JCheckBox object manage the three JRadioButtons This cannot be done in Java. Comments: Question 11.Question : (TCO 2) Which of the following creates a multiline display which is user editable? Student Answer: JLabel display = new JLabel(“Enter text”); JTextField display = new JTextField(“Enter text”); JTextArea display = new JTextArea(20, 20); JScrollPane display = new JScrollPane( ); Comments: Question 12 . Question : (TCO 2) The x, y drawing coordinate system used in Java graphics Student Answer: uses character units. has the origin in the upper left corner of the display area. uses the x coordinate for the vertical axis. All of the above Comments: Question 13 . Question : (TCO 2) Which of the following Java statements creates an object of a ButtonHandler class (which implements the ItemListener interface) and associates it with a JRadioButton object called buttonOne? Student Answer: buttonOItemListener(ButtonHandler( )); buttonOItemListener(new ButtonHandler()); buttonOne.+= new ButtonHandler( ); buttonOEventHandlerr(new ButtonHandler( )); Comments: Question 14 . Question : (TCO 2) Which of the following provides the basic attributes and behaviors of a Java window – a title bar at the top of the window and buttons to minimize, maximize, and close the window? Student Answer: JLabel JFrame JSwing JWindowsControl