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//chapter-4,Example4_1,pg 488
//it is a half-adder circuit with the output 'a' and carry 'c' given by the boolean equations
b1=1//input-1
b2=1//input-2
a=bitand(b1,bitcmp(b2,1))+bitand(bitcmp(b1,1),b2)//sum
c=bitand(b1,b2)//carry
printf("sum\n")
printf("a=%.f\n",a)
printf("carry\n")
printf("c=%.f",c)
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