How to Calculate the Logic Circuit Outputs?
Once the Boolean expression for a circuit output has been acquired, the output logic level can be determined for any set of input levels.
These are two illustrations of the evaluating logic circuit output
Let A=0, B=1, C=1, D=1
X = A'BC (A+D)'
= 0'*1*1* (0+1)'
= 1 *1*1* (1)'
= 1 *1*1* 0
= 0
Let A=0, B=0, C=1, D=1, E=1
X = [D+ ((A+B) C)'] * E
= [1 + ((0+0)1)'] * 1
= [1 + (0*1)'] * 1
= [1+ 0'] *1
= [1+ 1] * 1
= 1