Hậu tố khi khai báo define kiểu int

Integer constants in C and C++ can optionally have several suffixes:

123u      the value 123 is an unsigned int
123l       (that’s a lowercase L) 123 is a signed long
123L      ditto
123uL    unsigned long
123LL    a signed long long, a 64 bit or 128 bit value (depending on the environment)
123uLL  unsigned long long

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