What are the signs of crosses initialization?

Question

Consider the following code:

#include 
using namespace std;

int main()
{
    int x, y, i;
    cin >> x >> y >> i;
    swit         


        

Answer 1

It is possible to transfer into a block, but not in a way that bypasses declarations with initialization. A program that jumps from a point where a local variable with automatic storage duration is not in scope to a point where it is in scope is ill-formed unless the variable has POD type and is declared without an initializer.

[Example: Code:

void f()
{
  // ...
  goto lx;    // ill-formed: jump into scope of `a'
  // ...
 ly:
    X a = 1;
  // ...
 lx:
   goto ly;    // ok, jump implies destructor
 // call for `a' followed by construction
 // again immediately following label ly
}

--end example]

The transfer from the condition of a switch statement to a case label is considered a jump in this respect.