I am not quite understanding how to do this problem the only parts needed are the student provides missing code in the SDL file. Please explain the solution, i really want to understand this! Answers are upvoted.

Problem

Create a circuit that compares the 4-bit, unsigned, binary integers A and B for equality (EQ) and not-equality (NE). Use the attached SDL file Problem28Part1.sdl and the attached driver program Problem28Part1.cpp.

SAMPLE OUTPUT

$-----------------------------------------------------------

$ Problem28Part1.sdl

$-----------------------------------------------------------

COMPONENTS

Student provides missing component definitions

ALIASES

A3 = IN#1

A2 = IN#2

A1 = IN#3

A0 = IN#4

B3 = IN#5

B2 = IN#6

B1 = IN#7

B0 = IN#8

EQ = OUT#1

NE = OUT#2

CONNECTIONS

Student provides missing connections

END

//----------------------------------------------------

// Problem28Part1.cpp

//----------------------------------------------------

#include

#include

#define ONSTRING "1"

#define OFFSTRING "0"

#define UNKSTRING "?"

#include "SDLS.h"

FILE *OUTFILE;

//----------------------------------------------------

int main()

//----------------------------------------------------

{

try

{

CIRCUIT circuit;

OUTFILE = fopen("Problem28Part1.out","w");

circuit.Load("Problem28Part1");

fprintf(OUTFILE," A B EQ NE ");

fprintf(OUTFILE,"---- ---- -- -- ");

printf(" A B EQ NE ");

printf("---- ---- -- -- ");

for (STATE A3 = OFF; A3 >= ON; A3 = Predecessor(A3))

for (STATE A2 = OFF; A2 >= ON; A2 = Predecessor(A2))

for (STATE A1 = OFF; A1 >= ON; A1 = Predecessor(A1))

for (STATE A0 = OFF; A0 >= ON; A0 = Predecessor(A0))

for (STATE B3 = OFF; B3 >= ON; B3 = Predecessor(B3))

for (STATE B2 = OFF; B2 >= ON; B2 = Predecessor(B2))

for (STATE B1 = OFF; B1 >= ON; B1 = Predecessor(B1))

for (STATE B0 = OFF; B0 >= ON; B0 = Predecessor(B0))

{

circuit.SetIN("A3",A3);

circuit.SetIN("A2",A2);

circuit.SetIN("A1",A1);

circuit.SetIN("A0",A0);

circuit.SetIN("B3",B3);

circuit.SetIN("B2",B2);

circuit.SetIN("B1",B1);

circuit.SetIN("B0",B0);

circuit.SimulateLogic();

fprintf(OUTFILE,"%1s%1s%1s%1s %1s%1s%1s%1s %1s %1s ",

StateString(A3),StateString(A2),StateString(A1),StateString(A0),

StateString(B3),StateString(B2),StateString(B1),StateString(B0),

StateString(circuit.GetOUT("EQ")),

StateString(circuit.GetOUT("NE")));

printf("%1s%1s%1s%1s %1s%1s%1s%1s %1s %1s ",

StateString(A3),StateString(A2),StateString(A1),StateString(A0),

StateString(B3),StateString(B2),StateString(B1),StateString(B0),

StateString(circuit.GetOUT("EQ")),

StateString(circuit.GetOUT("NE")));

}

}

catch (SDLSEXCEPTION &exception)

{

printf("Exception: %s ",exception.GetErrorMessage());

}

fclose(OUTFILE);

system("PAUSE");

return( 0 );

}

SDL.h LINK: file:///C:/Users/Martin/Documents/SDL.h