CSE241- Assignment 4 Solved

Description

•    This is an individual assignment. Please do not collaborate

•    If you think that this document does not clearly describes the assignment, ask questions before its too late.

This assignment is about implementing and testing classes for a logic circuit simulator.

•    Your program reads two files:

–   circuit.txt

–   input.txt

•    According to content in circuit.txt, the program dynamically creates necessary objects for a logic circuit and evaluates the states listed in input.txt.

•    Your program prints the output to stdout. Each line in input.txt is a state. For each state, there should be

a line of output printed.

circuit.txt
•    Each line starts with a keyword. Possible keywords:

INPUT

OUTPUT

AND

OR

NOT

FLIPFLOP

DECODER

•    The first line specifies input labels. Labels are separated by spaces. Example:

INPUT a input2 c3 k

•    Here there are 4 inputs are defined. Each has an identifier. a, input2, c3, k.

•    The second line specifies output labels. Labels are separated by spaces. Example:

OUTPUT d1 d2 d3 d4

•    Here there are 4 outputs are defined. Each has an identifier. d1, d2, d3, d4.

•    AND keyword specifies that there is an and gate defined. AND keyword follows the identifier for its output and two other identifiers for the inputs. Example:

AND gate_A c3 another_id

•    Here the and gate has an output identified by the string gate_A. Its inputs are identified c3 and another_id. These identifiers can be input identifiers or identifiers for other gates.

•    OR keyword specifies that there is an or gate defined. OR keyword follows the identifier for its output and two other identifiers for the inputs. Example:

OR gate_B ck id3

•    Here the or gate has an output identified by the string gate_B. Its inputs are identified ck and id3. These identifiers can be input identifiers or identifiers for other gates.

•    NOT keyword specifies that there is a not gate defined. NOT keyword follows the identifier for its output and one other identifier for its input. Example:

NOT gate_C c5

•    Here the not gate has an output identified by the string gate_C. It has only one input an it is identified by the string c5.

•    FLIPFLOP keyword specifies that there is a flip-flop gate defined. FLIPFLOP keyword follows the identifier

for its output and one other identifier for its input. Example:

FLIPFLOP gate_F c6

•    Here the flip-flop gate has an output identified by the string gate_F. Its input is identified by c6.

•    DECODER keyword specifies that there is a decoder gate defined. DECODER keyword follows the identifiers for

its outputs(o1, o2, o3, o4) and identifiers for its inputs(a1, a2). Example:

DECODER d1 d2 d3 d4 g1 another_identifier

•    Here the decoder gate has outputs identified by strings o1, o2, o3, o4. Its inputs are identified by g1 and another_identifier.

input.txt
• Each line is a list of 1 and 0. Example:

1 0 1 1

0 1 1 1

0   0 1 0

1   0 0 1

Example:

•    Suppose that circuit.txt is has the following content:

INPUT a b c d

OUTPUT d1 d2 d3 d4

AND and1 a b

OR or1 and1 c

NOT n1 d

FLIPFLOP f1 n1

AND a2 or1 f1

DECODER d1 d2 d3 d4 a2 f1

•    input.txt has the following content:

1   1 0 1

1 0 1 0

1 1 1 0

•    Assume that initially former-out of any FLIPFLOP is 0.

•    Any FLIPFLOPs should preserve the state throughout the evaluation of the whole input.txt.

•    Each line in input.txt is assigned to identifiers a, b, c, d, defined in circuit.txt. According to the truth tables, outputs of gates are calculated.

•    For the input.txt given, the output of your program should be:

1   0 0 0

0   0 0 1

1   0 0 0



Figure 1: Example Logic Circuit

Remarks

•    Each identifier is unique. You can assume that their length is limited to 15 characters. You can use std::string.

•    There won’t be any errors in the files.

•    You have to use dynamic memory allocation and C++ classes.

•    You have use inheritance and polymorphism. Find a class hierarchy and try to use abstraction.

•    You are not allowed to used std::vectors.

•    You cannot use components which are not covered in class. (such as templates etc..)

•    In order to learn about file I/O operations, you can go through the related book chapter(not covered in class). Or you can read the section presented in assignment 3.

Turn in:

•    Source code of a complete C++ program and a suitable makefile. You should use c++11 standard. Your code will be tested in a linux-gcc environment.

•    A script will be used in order to check the correctness of your results. So, be careful not to violate the expected output format.

•    Provide comments unless you are not interested in partial credit. (If I cannot easily understand your design, you may loose points.)

•    You cannot get full credit if your implementation contradicts with the statements in this document.

Truth Tables:

•    AND

a
b
out
0
0
0
0
1
0
1
0
0
1
1
1
 
 
 
a
b
out
0
0
0
0
1
1
1
0
1
1
1
1
•    OR

•    NOT

a
out
0
1
1
0
•    FLIPFLOP

a
former_out
out
0
0
0
0
1
1
1
0
1
1
1
0
•    DECODER

a1
a2
d1
d2
d3
d4
0
0
1
0
0
0
0
1
0
1
0
0
1
0
0
0
1
0
1
1
0
0
0
1