for above c code fragment , answer would be ?

Question

char c1 = -128 , c2 c3;

c2=c1+10;   

c3=c1-10;

printf(c3);

(ANS=>   c3=+118   why???????)

Answer 1

C1 memory representation :-1 0 0 0 0 0 0 0 (-128) In 8 Bits

-10 memory Representation:- 1 1 1 1 0 1 1 0     In 8 Bits

At Line no 3 we are doing addition operation for that c1 Firstly get promoted into integer type and the addition will happen

       1 0 0 0 0 0 0 0 (-128) 

       1 1 1 1 0 1 1 0  ( -10)

   + 0 1 1 1 0 1 1 0  (+118)

At compile time compiler will give an overflow warning.but it will run successfully.