That's I know buddy, what I am asking is methods, manual methods to do that.....to do conversion of all the things and also vice-varas.

D - B
D - O
D - H

B - D
B - O
B - H

O -D
O - B
O - H

H - D
H - B
H - O

D=DECIMAL
B=BINARY
O=OCTAL
H=HEX