why initializing a variable in switch case give me error while compilation

Question

I am writing one sample c++ program , but while initializing the variable inside the switch case it gives me compilation error.

if i am declaring it like int x; its not giving the error, same is happening when i am doing it inside a case block also.

#include <iostream>

using namespace std;

int main()
{
    int x=3;
   switch(x)
   {
       int y=10;
       case 2:
          cout<< "c++";
   }
}

this gives me error like error: jump to case label [-fpermissive]

can anybody clarify my doubts