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+//Example 1.15: add -5 to 7, -5 and +5 , -5 and +3
+clc//clears the console
+clear //clears all existing variables
+//****************************************************************************
+x=bitcmp(5,4) //finds complement of 5
+y=1;
+u=x+y //1 is added to the complement
+v=7;
+w=u+v
+a=dec2bin(w) //binary conversion of the decimal number
+disp(' binary form of the number obtained by adding 7 to -5 ')
+disp(a) //result is displayed
+disp(' the msb is discarded,so four bit representation in binary form =') 
+a=dec2bin(w-(2^4),4)
+disp(a) //final result is displayed.
+disp('*****************************************************************')
+//****************************************************************************
+x=bitcmp(5,4) //finds complement of 5
+y=1;
+u=x+y //1 is added to the complement
+v=5;
+w=u+v
+a=dec2bin(w) //binary conversion of the decimal number
+disp(' binary form of the number obtained by adding +5 to -5 ')
+disp(a) //result is displayed
+disp(' the msb is discarded,so four bit representation in binary form =') 
+a=dec2bin(w-(2^4),4)
+disp(a) //final result is displayed.
+disp('*****************************************************************')
+//****************************************************************************
+x=bitcmp(5,4) //finds complement of 5
+y=1;
+u=x+y //1 is added to the complement
+v=3;
+w=u+v
+a=dec2bin(w,5) //binary conversion of the decimal number
+disp(' binary form of the number obtained by adding +3 to -5 ')
+disp(a) //result is displayed
+disp(' the msb is discarded,so four bit representation in binary form =') 
+a=dec2bin(w,4)
+disp(a) //final result is displayed.
+disp('*****************************************************************')