complement method of binary subtraction

This  method is  used for  subtraction  as subtraction is  converted to addition.

Use following  steps  to perform  subtraction ;

Write the first(positive )  number  in original form.

Find the  2 s complement  form of the  second(negative ) number.

Add positive number with 2  complement form  of the negative number.

If carry is generated then neglect the carry remaining answer will be the answer of the subtraction. The  will be the  case when positive  number  is more then the negative number.

If carry  is not generated  then the answer  is negative  and is in 2 complement form. This will  be the  case  when negative number is more than the positive number.