An interface technique for design and analysis of digital circuit has been devised and described in this study. Basically logic circuits are of two types, one combinational circuit and other is sequential circuit. Logic simulation usually means finding the transient response to a set of time-varying inputs. Simulation follows functional or behavioral level design. Behavioral simulation describes logic function and timing. Functional simulation describes the logic function of a system only but ignores the timing. A simulation program for giving output of digital logic circuits is available now-a-days. But, an approach taken here describes an efficient way to analyze both combinational and sequential circuit. To do this an algorithm has been developed. Finally, a program is coded in Turbo C language and tested for test cases to analyze and give output to that logic circuit.