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以下代码语法正确的是（ ）。
int m;
cin >> m;
switch (m)
{
case 1:
cout << "item 1"; break;
default:
cout << "default item"; break;
case 0:
cout << "item 0"; break;
}
int m;
cin >> m;
switch m:
{
case 0:
cout << "item 0"; break;
case 1:
cout << "item 1"; break;
default:
cout << "default item";
}
int n = 1;
int m;
cin >> m;
switch (m)
{
case 0:
cout << "item 0"; break;
case n:
cout << "item 1"; break;
default:
cout << "default item";
}
double m;
cin >> m;
switch (m)
{
default:
cout << "default item"; break;
case 0:
cout << "item 0"; break;
case 1:
cout << "item 1"; break;
}
