Point of declaration in C++

Question

Why isn\'t the output 101 while I assigned the previous x to the new x?

int x = 101;
{
    int x = x;
    std::cout &l         


        

Answer 1

variable scope In front of x will be overwritten. int x = x; This one there are two processes. One: int x;(define variable x and allocate memory and specify the initial value : x = 0); this moment , the front x will be hidden. Two: x = x;(Do not find the value x);