c – What do numbers using 0x notation mean?

c – What do numbers using 0x notation mean?

Literals that start with 0x are hexadecimal integers. (base 16)

The number 0x6400 is 25600.

6 * 16^3 + 4 * 16^2 = 25600

For an example including letters (also used in hexadecimal notation where A = 10, B = 11 … F = 15)

The number 0x6BF0 is 27632.

6 * 16^3 + 11 * 16^2 + 15 * 16^1 = 27632
24576    + 2816      + 240       = 27632

In C and languages based on the C syntax, the prefix 0x means hexadecimal (base 16).

Thus, 0x400 = 4×(162) + 0×(161) + 0×(160) = 4×((24)2) = 22 × 28 = 210 = 1024, or one binary K.

And so 0x6400 = 0x4000 + 0x2400 = 0x19×0x400 = 25K

c – What do numbers using 0x notation mean?

Its a hexadecimal number.

0x6400 translates to 4*16^2 + 6*16^3 = 25600

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