1) You want to determine whether time has run out. The following code correctly implements this:
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1 Exam Name TRUE/FALSE. Write ʹTʹ if the statement is true and ʹFʹ if the statement is false. 1) You want to determine whether time has run out. The following code correctly implements this: 1)!time > limit 2) The value of count is 0; limit is 10. Evaluate: 2) (count == 0)&&(limit < 20) 3) The value of count is 0; limit is 10. Evaluate: 3) (count!= 0) (limit < 20) 4) In a while loop, the Boolean_Expression is executed before each execution of the loop body. 4) 5) When a loop is nested inside another loop, a break or continue statement terminates or restarts the outermost loop of the nested loop structure. 5) MULTIPLE CHOICE. Choose the alternative(s) that best complete(s) the statement or answer(s) the question. 6) Which of these control constructs repeats a sequence of statements zero or more times? A) switch statement B) if- statement C) do-while statement D) while statement E) for statement 6) 7) Which of the following is true of the && operator? A) It can have one operand. B) It returns true if either operand is true. C) It is the logical AND operator. D) It uses short circuit evaluation. E) It has two operands. 7) 1
2 8) The following program purports to sum all entered int values that are greater than 5. It compiles without any error message, and it executes without error message, but nevertheless is wrong. Name all the errors. 8) // Display the sum of all entered int values // greater than 5 #include <iostream> int main() using namespace std; int x, sum; while (x < 10) cin >> x; if (x > 5); sum = sum +x; cout << "The sum is values > 5 is " << sum << endl; A) The semicolon at the end of the if statement causes all entered values to be summed. B) The while header needs a semicolon at the end of its line. C) The sum variable is not initialized, so the output value is most likely garbage. D) The semicolon at the end of the if statement is an error that the compiler should catch. 9) If this code fragment were executed in an otherwise correct and complete program, what would the output be? Explain. 9) int a = 3, b = 2, c = 5 if (a > b) a = 4; if ( b > c) a = 5; a = 6; cout << a < endl; A) 4 B) 6 C) 3 D) 5 E) none of the above 10) Which of the following is a legal call to the displayoutput function? void displayoutput(int total); A) displayoutput(mytotal); B) cout << displayoutput(mytotal); C) displayoutput(int mytotal); D) void displayoutput(mytotal); 10) 2
3 11) If the following code fragment is executed in an otherwise complete and correct program, which expression will be executed? Why? 11) x = 0; if (x = 12) yes_statement; no_statement; A) The yes_statement will be executed. B) The statement has incorrect syntax so will not compile at all. C) The no_statement will be executed because x is not 12. D) x=12 is illegal in the Boolean expression of an if statement. 12) What is the output of the following function and function call? void calculatecost(int count, float& subtotal, float& taxcost); 12) float tax = 0.0, subtotal = 0.0; calculatecost(15, subtotal,tax); cout << ʺThe cost for 15 items is ʺ << subtotal << ʺ, and the tax for ʺ << subtotal << ʺ is ʺ << tax << endl; //end of fragment void calculatecost(int count, float& subtotal, float& taxcost) if ( count < 10) subtotal = count * 0.50; subtotal = count * 0.20; taxcost = 0.1 * subtotal; A) The cost for 15 items is 0.00, and the tax for 3.00 is 0.00; B) The cost for 15 items is 0.00, and the tax for 3.00 is 0.30; C) The cost for 15 items is 3.00, and the tax for 3.00 is 0.00; D) The cost for 15 items is 3.00, and the tax for 3.00 is 0.30; 13) 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 not valid. E) All are valid. 13) 3
4 14) You should make a parameter a reference parameter if A) always B) you need the function to change the value of the argument passed to the function. C) you need to be able to change the value of the parameter in the function, but not the value of the argument. D) any of the other parameters are reference parameters. 14) 15) Which of the following are true? A) As long as the function is defined anywhere in your program, it can be used anywhere. B) A function definition can contain another function definition. C) A function can call another function. D) If you have function prototypes, the order in which you define your functions is important. 15) 16) 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) float display( ); C) int display (float mycost); D) void display(float mycost); 16) 17) Given the function definition 17) 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 << ʹ ʹ << s << ʹ ʹ << t << endl; A) B) C) D) E) none of the above 18) If a function needs to modify more than one variable, it must A) be a void function. B) be a call by reference function. C) be pass by value. D) return all values needed. 18) 19) If you write a function that should use call-by-reference, but forget to include the ampersand, A) the program will run with incorrect results. B) the program will not link. C) the program will not run without a run-time error. D) it doesnʹt matter. E) the program will not compile. 19) 4
5 Answer Key Testname: ) FALSE 2) TRUE 3) TRUE 4) TRUE 5) FALSE 6) D, E 7) C, D, E 8) A, C 9) B 10) A 11) A 12) D 13) E 14) B 15) C 16) D 17) A 18) B 19) A 5
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