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

You should put the contents of the case in brackets to give it scope, that way you can declare local variables inside it:

switch(i) {
    case 1:
        {
            // int r = x + y; -- OK
            int r = 1; // Failed to Compile
            cout << r;
        }
        break;
    case 2:
        ...
        break;
};