@Shashank, You didn't get it properly. If leftmost bit *0*, then it is a *+ve* number. If it's *1* then it's a *-ve* number.
Let's take above example with 16 bit: a=6 binary: 0000 0000 0000 0110 (note that leftmost bit is 0, so it's +ve number) ~a= 1111 1111 1111 1001 (now leftmost bit is 1, so compiler will treat it as -ve number.) To obtain its *-ve decimal value* you need to calculate it's 2's complement. (note that the value obtained with 2's comlement would be - ve). Also you can cross verify that ~a represented above is -7. Simple math -7 +7 =0; 1111 1111 1111 1001 0000 0000 0000 0111 ------------------------------ 00000000000000000 Kindly, check out following link for more details on 2's complement: http://academic.evergreen.edu/projects/biophysics/technotes/program/2s_comp.htm Thanks, Yasir On Aug 7, 6:01 pm, Shashank Jain <[email protected]> wrote: > nd moreover after 2's complement its 0000 0111 which is 7 nd not -7. so how? > Shashank Jain > IIIrd year > Computer Engineering > Delhi College of Engineering > > > > > > > > On Sun, Aug 7, 2011 at 6:25 PM, Shashank Jain <[email protected]> wrote: > > so tell me fr any bit representation, 1st bit is for sign only na? > > > Shashank Jain > > IIIrd year > > Computer Engineering > > Delhi College of Engineering > > > On Sun, Aug 7, 2011 at 6:03 PM, Yasir <[email protected]> wrote: > > >> 8 bit was taken just for example. It can be 16/32 bit but that won't > >> make any difference on leading 0's or 1's. > > >> On Aug 7, 5:28 pm, Shashank Jain <[email protected]> wrote: > >> > y r we taking 8 bit numbers, i mean dat way we cant go beyond -127 to > >> 127? > > >> > Shashank Jain > >> > IIIrd year > >> > Computer Engineering > >> > Delhi College of Engineering > > >> > On Sun, Aug 7, 2011 at 5:39 PM, Yasir <[email protected]> wrote: > >> > > let say a=6; binary= 0000 0110 > >> > > b = ~a = 1111 1001 > >> > > Now when you print value of ~a or b, it is calculating 2's complement. > >> > > 1's complement: 0000 0110 > >> > > 2's complement: 0000 0111 (value = -7) > > >> > > Pls check signed bit representation for details. > > >> > > On Aug 7, 4:40 pm, Shashank Jain <[email protected]> wrote: > >> > > > bitwise complement operator (~), complements d digits of d input bt > >> when > >> > > i > >> > > > use it : > > >> > > > int a,b; > >> > > > b=~a; > > >> > > > output: its giving o/p such that b= -a-1; > > >> > > > why is dat so? > > >> > > > Shashank Jain > >> > > > IIIrd year > >> > > > Computer Engineering > >> > > > Delhi College of Engineering > > >> > > -- > >> > > You received this message because you are subscribed to the Google > >> Groups > >> > > "Algorithm Geeks" group. > >> > > To post to this group, send email to [email protected]. > >> > > To unsubscribe from this group, send email to > >> > > [email protected]. > >> > > For more options, visit this group at > >> > >http://groups.google.com/group/algogeeks?hl=en. > > >> -- > >> You received this message because you are subscribed to the Google Groups > >> "Algorithm Geeks" group. > >> To post to this group, send email to [email protected]. > >> To unsubscribe from this group, send email to > >> [email protected]. > >> For more options, visit this group at > >>http://groups.google.com/group/algogeeks?hl=en. -- You received this message because you are subscribed to the Google Groups "Algorithm Geeks" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en.
