This is a closed book test. You may use one 8.5x11 sheet of prepared notes, written on both sides. You have 90 minutes. Answer all of the questions.
struct Widget { int side; char* front; char bottom[22]; Widget() {} Widget(int s, char* f, char *b) { side = s; front = f; strcpy(bottom, b); } };
#include <iostream.h> int main() { char* word; cin >> word; cout << word << endl; return 0; }
void test() { int* s; int* p = new int; int* q = p; int* r = new int; *r = 17; s = r; *r = 41; *q = *s; p = s; *r = 8; r = q; cout << "*p = " << *p << endl; cout << "*q = " << *q << endl; cout << "*r = " << *r << endl; cout << "*s = " << *s << endl; }
This function works by copying each string, replacing lower case letters by upper case letters, and then using library function strcmp to tell whether the resulting strings are the same. (strcmp(s,t) returns 0 if strings s and t are equal, -1 if s comes before t in alphabetical order, and 1 if s comes after t in alphabetical order.) The function also uses function toupper, which converts a lower case letter to upper case, and returns all other characters unchanged. So toupper('a') = 'A' and toupper(':') = ':'.
There is a serious mistake in this function. Explain what the mistake is, and rewrite the function to avoid the mistake. You might need to make more than one change, but try to keep the spirit of the method instead of choosing a completely different method, even if you think this method can be improved upon. Make sure the external behavior of the function is correct.
bool sameUpper(char* x, char* y) { char *cpyx, *cpyy; int xlen = strlen(x); int ylen = strlen(y); int i; if(xlen != ylen) return 0; for(i = 0; i <= xlen; i++) { cpyx[i] = toupper(x[i]); cpyy[i] = toupper(y[i]); } if(strcmp(cpyx, cpyy) == 0) return 1; else return 0; }