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diff --git a/462/CH2/EX2.27.b/ex_2_27_b.sce b/462/CH2/EX2.27.b/ex_2_27_b.sce
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+//example 2.27 (b)//
+clc
+//clears the screen//
+clear
+//clears already existing variables//
+x=oct2dec('26')
+//octal to decimal conversion//
+y=oct2dec('75')
+z=x-y
+//subtraction//
+t=z*(-1)
+t1=bitcmp(t,8)
+//1's complement//
+t2=t1+1
+//2's compliment//
+a=dec2bin(t2)
+//decimal to binary conversion//
+disp('answer in 2''s compliment form:')
+disp(a)
+//answer in 2's complement form//
+\ No newline at end of file