使用类型转换后为何打印同一个变量会出现两个不同的结果

代码:

const char var = 'a';
auto static_var = static_cast<char>(var);
auto const_var = const_cast<char*>(&var);

cout << "var: \t\t" << var << "\taddress:\t" << reinterpret_cast<long>(&var) << endl;
cout << "static_var: \t" << static_var << "\taddress:\t" << reinterpret_cast<long>(&static_var) << endl;

*const_var = 'b';

cout << "const_var: \t" << *const_var << "\tptr:\t\t" << reinterpret_cast<long>(const_var) << endl;
cout << "var(direct): \t" << var << "\taddress:\t" << reinterpret_cast<long>(&var) << endl;
cout << "var(ptr): \t" << *(&var) << "\taddress:\t" << reinterpret_cast<long>(&var) << endl;

输出:

var:            a       address:        6122386111
static_var:     a       address:        6122386110
const_var:      b       ptr:            6122386111
var(direct):    a       address:        6122386111
var(ptr):       b       address:        6122386111

平台:

• macbook pro 13 M1
• macOS 11.6
• Xcode 13.0
• Clang 13.0

请教大家一下, 为何最后两种输出的结果不一样, 这是什么原因导致的