121
Exam CPSC 2 Review Key
d. declare a new name for an existing variable
e. None of the above
Short answer
19. What is wrong with this code fragment?
try {
//some code goes here
}
catch() {
cerr << Exception!\n;
keep_window_open();
return 1;
}
catch(const logic_error& e) {
cerr << Logic error: << e.what() << \n;
keep_window_open();
return 2;
}
The catch all exceptions catch has been placed before the catch specific exceptions catch. All
exceptions will be caught by the and none by the logic_error, which defeats the purpose of it being
there. The logic_error catch should be placed first.
20. Write a function (call it swapie( )) that two takes doubles as arguments and swaps their values; i.e., if
x == 14 and y == 7 before you call swapie( ), then after you call swapie( ) x == 7 and y == 14.
void swapie( double& a, double& b) {
double temp;
temp = a;
a = b;
b = temp;
}
21. Given the partial code below, add lines of code to complete the square.
Polygon p;
//closed shape
p.add(200, 200);
p.add(200, 300);
p.add(300, 300);
p.add(300, 200);
22. It is sometimes said that a programmer is someone who cannot tell the difference between Halloween
and Christmas, so what is the output of the following?
cout << oct << 031 << \n;
cout << dec << 25 << \n;
31
25