CSE143 Exam with answers MIDTERM #1, 1/26/2001 Problem numbering may differ from the test as given.
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1 CSE143 Exam with answers MIDTERM #1, 1/26/2001 Problem numbering may differ from the test as given. All multiple choice questions are equally weighted. You can generally assume that code shown in the questions is intended to be syntactically correct, unless something in the question or one of the answers suggests otherwise. 1. [NOT GRADED] Read through this code fragment and determine what (if anything) is wrong with this code. int i; //line 1 int * ip; //line 2 ip = &i; //line 3 delete ip; //line 4 A. line 3 is illegal, because ip is not a reference parameter. B. line 4 is a syntax error; it should read delete *ip because ip is a pointer. C. line 4 has no syntax error, but represents a logic error because i has not been initialized. D. line 4 has no syntax error, but represents a serious programmer error in dynamic memory usage. E. no apparent errors ANSWER: D 2. In object-oriented programming, the term "method" A. simply means a member function of a class B. means any algorithm or way of doing things in a program C. means a particular technique for defining variables D. refers to the arguments passed to a constructor E. is used in connection with the software lifecycle to describe a particular way of developing quality software 3. int i; double d; char c; char str[100]; cin >> i >> d >> c >> str; cout << str; Suppose at the point where the statement with cin above is executed, the user types in King Dome (The leading spaces are part of what is typed in.) What will be the result displayed by the line with cout? A. Can't tell, because an error would have occurred reading in the variable i B. King Dome C. King D. ing Dome E. ing ANSWER: E
2 Page 2 4. Trace through the operation of this code, and then pick the true statement it: #include <iostream> void f (int& p1, int& p2) { p1 = p2 + 7 * 2; int main (void) { int x, y; x = 2; f (x, x); y = x; f (y, y); cout << x << endl; return 0; A. It prints the value 18 B. y's value after the call f (y, y) is 16 C. It prints the value 30 D. It prints the value 16 E. It prints the value 2 ANSWER: D 5. cout is what? A. An object (a variable whose type is a class) B. A library function C. A system file D. A C++ operator E. A class 6. The process of going from a set of source files to a running program has several steps. Place the following in the correct order from the first step executed to the last: A.) Linking B.) Compiling C.) Execution D.) Processing #include directives A. B, D, A, C B. B, C, A, D C. D, B, A, C D. D, A, B, C E. A, D, B, C ANSWER: C
3 Page 3 7. Which represents a proper use of the new C++ type for Boolean values? A. char errorflag = "true"; B. bool errorflag = true; C. bool errorflag = FALSE; D. enum errorflag = {true, false; E. Boolean errorflag; ANSWER: B 8. The filestream declared as ifstream ifile; has been opened successfully. This line of the program ifile >> count; executes, where count is an integer variable. However, the file at this point contains the letter 'x' rather than a valid integer. Which code properly detects such an error? A. if (ifile) { //OK else { //error B. if (ifile[0]!= int) { C. char chcount = char (count); if (isalpha(chcount)) { D. if (isalpha(count)) { E. if (ifstream.error()) { 9. The typical reason for using assert() in a program is A. to detect user input errors B. to display confidence (assertiveness) in one's ability to program C. to check invariants D. to guard against undeclared identifiers E. to inform the caller (of the function in which the assert is located) whether or not there was an error ANSWER: C
4 Page A "module" is best described as A. any.cpp file B. any.h file C. another name for a program D. a self-contained unit of code E. any method or function apart from main() ANSWER: D 11. "Data + Operations" is a characterization of A. functional decomposition B. operator overloading C. overloaded constructors D. modularity E. (abstract) data type ANSWER: E 12. Study the following fragment of class declaration and method implementation. Note that in the method, the "legs" variable of three different objects is referred to. Are all of these references legal? A. Line A is legal B. Line B is legal C. Line C is legal class chair { private: int legs; int back; double weight; public: chair copy (chair other); ; chair chair::copy(chair other) { chair tempchair; int templegs = other.legs; //Line A tempchair.legs = templegs; //Line B legs = templegs; //Line C A. A only B. B only C. C only D. B and C only E. all of A, B, and C ANSWER: E
5 Page Suppose you see this in a valid C++ program. a, b, c, d, and e are all valid identifiers (none of them are reserved words): void myfunction (a b, c d) { a e (b, d);.. Given this, what might you expect to find as a prototype in a class specification somewhere? A. a e (b x, d y); B. a (a, c); C. a e (a, c); D. e::e (a, b); E. a e (b. d); ANSWER: B 14. Food is the name of a class. A function contains an array declared as Food menu[20]; What is true? A. If there is a default constructor for Food, it will be called 20 times to initialize the elements of menu. B. If there is a constructor for Food which takes an array argument, that constructor will be called for the initialization of menu. C. The menu is uninitialized. [Of course, it might be initialized by some later statements.] A. A only B. B only C. C only D. A and B only E. None of A, B, or C
6 Page [NOT GRADED] bool F(int low, int high) { if (low > high) return false; if (low == high) return true; else return F(low + 2, high + 1); Consider the state of A and B after the following two calls: bool A = F(5, 7); bool B = F(0, 4); A. A is false, B is false B. A is false, B is true C. A is true, B is false D. A is true, B is true E. The program does not terminate (infinite recursion) ANSWER: C 16. (Worth 4 multiple choice questions) On a separate handout you have the header file for class which represents a List of ints. The header file is practically the same as the one used in last week's quiz (adapted from the Carrano, Helman, and Veroff textbook, p.136.) Your job is to implement a new method. Here is what will be added to the public: section of the.h file: void ListInsertBefore(int elementbefore, int newvalue, bool & Success); /* Inserts newvalue into a list, before an element with a value equal to elementbefore. Postcondition: If there is an element in the list with a value equal to elementbefore, NewItem is inserted at a position directly before that element, other list items are moved accordingly, and Success is true; otherwise Success is false, and the list is unchanged. (If there is more than one list element equal to elementbefore, it does not matter which one the newvalue is placed before. */ Example: suppose the list currently contains and a client makes a call with the first two arguments as Then the method give true as the result, and the list has the elements Your task: give a complete implementation of ListInsertBefore. Make no changes to the.h file. [You should follow the handout quite strictly in developing your answer. The quiz was graded pass/fail, but this problem won't be!]
7 Page 7 /************************* sample solution ******************/ //Two possible implementations void listclass::listinsertbefore (int ElementBefore, int NewValue, bool &Success) { Success = false; assert(size <= MAX_LIST); if (Size >= MAX_LIST) return; int i; for (i = 0; i < Size; i++) { if (Items[i] == ElementBefore) { // found it // shift the other elements and insert the new value for (int j = Size; j > i; j--) { Items[j] = Items[j-1]; Items[i] = NewValue; Success = true; Size++; return; // version 2 void listclass::listinsertbefore(int elementbefore,int newvalue,bool &success) { assert(size <= MAX_LIST); success = false; for(int i=0;i < Size; i++) if(items[i] == elementbefore) { ListInsert(i+1,newValue,success); //the call to ListInsert will do its job, if it can, //and set success apprpriately //It will also have updated Size (unless the array was full) return;
double d0, d1, d2, d3; double * dp = new double[4]; double da[4];
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