unary operators

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In this blog
unary minus (-)
increment ( ++)
decrement (--)
loagical NOT ( ! )and bitwise NOT ( ~)
Address of operator (&) and Indirection ( * )
sizeof ()

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Unary minus (-)

unary minus in c is generally used to invert the sign of the operand  for eg , a = -10  so  -a will be  10 and keep in mind that the unary minus is different from binary minus

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increment ( ++)

.) increment operator is used to increase a particular value by 1  for eg , a = 10  so  a++ would be 11 .

.) increment operator is of further  of 2 types  postfix(a++ )and prefix(++a) increment 

.) in an expression when post fix increment is used , like

then first the value of operand is used ,  in this case it is 1 so expression answer would be 2 and after that the value of operand would be incremented 

.) in an expression when prefix increment is used , like

then first the value of operand is incremented then after that expression  would be evaluated answer to this expression is 3.

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decrement ( -- )

.) decrement operator is used to decrement the value of operand by 1

.)decrement operator is further of 2 type postfix(a--) and prefix(--a) , meaning of these are same as of  increment 

.)  value of the expression   (a--) +1  if a is 1 would be 2 and after the expression is evaluated then value of a is decremented 

.) value of expression  (--a) +1 would be 1.

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logical NOT and bitwise NOT

these operator would be discussed late in logical operators.

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Address of operator(&) and indirection operator(*)

.) Address of operator  when used with variable gives the address of that location , eg  when a = 5 the   &a would give the address where 5 is stored 

.) indirection operator is used with pointer , i know that you would not know about pointer  but just remember that  when used with pointer it gives the value of the variable which the pointer is pointing at.

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sizeof()

.) sizeof operator is used is we want to know the size of a data type or a variable eg ..

sizeof operator always return the value in long unsinged integer so always use %lu format specifier.