[C/C++] Remind! '>>' extends sign bit

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'shift' operator in C extends sign bit.

int a = 0xffffffff;
a = a>>8; // a == 0xffffffff

Due to sign of 'a' is minus, '>>8' preserve it's sign.
But, 'unsigned' value is always '>=0' So, sign bit doesn't need to be extended. So, front parts is filled with '0'.

unsigned int a = 0xffffffff
a = a >>8; // a == 0x00ffffff