//chapter-4,Example4_5,pg 489
//if A8,B8,C8,D8 is the binary in 8421 code, for 12 this would be 1100(DCBA)
//in 8421-code
A8=0
B8=0
C8=1
D8=1
//in 2421-code
D2=D8
C2=bitor(C8,D8)
B2=bitor(B8,D8)
A2=A8
printf("2421-code for 12 is\n")
printf("%.f ",D2)
printf("%.f ",B2)
printf("%.f ",C2)
printf("%.f ",A2)