In a C++ program, which of the following can be thrown? A. scalar variables B. programmer-defined objects C. both (a) and (b) D. neither (a) nor (b)

The correct answer is C. both (a) and (b).

In C++, a scalar variable is a variable that can hold a

Both scalar variables and programmer-defined objects can be thrown as exceptions in C++. When an exception is thrown, the program execution is stopped and control is transferred to a handler that is specified by the programmer.

Here is an example of how a scalar variable can be thrown as an exception:

c++
int main() {
int x = 10;
try {
if (x == 0) {
throw x;
}
} catch (int e) {
std::cout << "Exception caught: " << e << std::endl;
}
return 0;
}

In this example, the variable x is checked to see if it is equal to 0. If it is, the exception x is thrown. The catch block catches the exception and prints the value of x to the console.

Here is an example of how a programmer-defined object can be thrown as an exception:

“`c++
class MyObject {
public:
void foo() {
throw std::logic_error(“Error in foo”);
}
};

int main() {
MyObject obj;
try {
obj.foo();
} catch (std::logic_error e) {
std::cout << “Exception caught: ” << e.what() << std::endl;
}
return 0;
}
“`

In this example, the object obj is created and its foo() method is called. The foo() method throws an exception of type std::logic_error. The catch block catches the exception and prints the message “Error in foo” to the console.