Help me please to understand code

Question

int x(int &a,int &b){
a=1;
b=3;
return a*b;
}
int main()
{
int a=3;
int b=4;
int c=(b,b) ;
cout<<a<<b<<c;

Answer 1

Variable b passed via reference into both parameters of function x.

In function x, original passed value is 4. Altered to 1 on first line, then altered to 3 on second line. Returns 3*3. Hence, local variable c is 9.

The key here is to understand that in function x, a and b refers to the same variable, because both parameters were filled with local variable b, which was passed via reference.

Final output : 339

Answer 2

I dont to disapoint you, but output 344, i checked))

Answer 3

That's why im asking