Type in a code to declare variable b and assign a's value to b and print the output to screen

Question

int a=15;
int b=___;
cout <<a___b<<endl;
return 0

Answer 1

int a=15;
int b=a;
cout << a << b << endl;
return 0;

WTF. For what is this question?

Answer 2

int a=15;
int b=_a__;
cout <<a_+__b<<endl;
return 0

Answer 3

int a = 15;

int b =
a
;

cout << a
+
b << endl;