Variable and Comment in C++ MCQs Exercise I

Ques 1 Variable and Comment

Which of the following is the correct identifier in C++?
  a) var_123
  b) 123_var
  c) $__var
  d) #var

Ques 2 Variable and Comment

What is the output of following code?

int main()
{
    string new = "SmallCode";
    cout<<"new is: "<<new;
    return 0;
}

Ques 3 Variable and Comment

Which of the following is the correct way to declare a variable?
  a) int arr[];
  b) int %num;
  c) var num;
  d) int x[7] ;