Convert two's complement to sign-magnitude

Question

I need to convert from two\'s complement to sign-magnitude in C using only the operators

! ~ & ^ | + << >>

My approach is t

Answer 1

To get the last bit you could use mask operation

   int last_bit = 32 bit integer & 0x80000000 
   o/p  may be 0 or 0x80000000    

if it is 0 just display the given number else you have to perform the following operations to represent in signed magnitude

1) Subtract 1 from the number

2) perform 1s complement on the resultant ( that is negation ~)

3) Set the last bit of the resultant number

 I mean  ( ~ (num -`1) ) | 0x7fffffff 

since your restricted not to use - operator. Perform the 2's complement on -1 and add it to the num.

To put it simple in one line
 num & 0x80000000 ? printf("%d",(~(num+((~1)+1))) | 0x7fffffff) : printf("%d",num)   ;