Explain the code

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Answer 1

It outputs a character before 'c' which is 'b'.
'c' in ascii code has value of 99.
'c'*-1=-99
-99 in binary form is: 10011101.
~(-99) is : 01100010 = 98

98 in ascii code is 'b' in char form.

Answer 2

Printf("%c \n",~('c' * -1));

Answer 3

Thank you

Answer 4

Explain that line