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======XOR class======

The XOR class implements a functioning logical XOR gate for use with our CPU simulator.

=====XOR() constructor=====

<code c++>
XOR myXorGate;
</code>

^  Function  ^  Parameter(s)  ^  Return value  |
|  XOR()  |  none  |  pointer/variable instantiation of the newly allocated XOR gate  |

XOR() is the parameterless constructor that is responsible for creating a new instance of an XOR.

=====reset()=====
reset() will reset both inputs coming into the XOR to FALSE values.

<code c++>
myXorGate.reset();
</code>

^  Function  ^  Parameter(s)  ^  Return value  |
|  void reset()  |  no parameters  |  none  |

=====set(bool)=====
set(bool) will take the parameter and set both inputs to that value.

<code c++>
myXorGate.set(true);
</code>

^  Function  ^  Parameter(s)  ^  Return value  |
|  void set()  |  bool  |  none  |

=====set(bool, bool)=====
set(bool, bool) will take the parameter and set each input to a unique value.

<code c++>
bool a = true;
bool b = false;

...

myXorGate.set(a, b);
</code>

^  Function  ^  Parameter(s)  ^  Return value  |
|  void set()  |  bool, bool  |  none  |

=====setvalue()=====
get() will retrieve the output of the XOR.

<code c++>
bool output = myXorGate.get();
</code>

^  Function  ^  Parameter(s)  ^  Return value  |
|  bool get(int)  |  none  |  boolean value of gate's output  |
\\
**xor.h**\\
<code>
#ifndef _XOR_H
#define _XOR_H
class XOR
{
        public:
                XOR();

                void set();
                void set(bool);
                void set(bool, bool);
                bool get();

        private:
                bool input1;
                bool input2;
};
#endif
</code>
\\
**xor.cc**\\
<code>
#include "xor.h"

XOR::XOR()
{
        input1 = input2 = false;
}

void XOR::set()
{
        input1 = input2 = false;
}

void XOR::set(bool value)
{
        input1 = input2 = value;
}

void XOR::set(bool val1, bool val2)
{
        input1 = val1;
        input2 = val2;
}

bool XOR::get()
{
        bool result = false;
        if ((input1 == true && input2 == false) || (input1 == false && input2 == true))
        {
                result = true;
        }

        return (result);
}
</code>
\\
**xortest.cc**\\
<code>
#include <cstdio>
#include "xor.h"

int main()
{
        bool a, b;
        a = true, b = false;

        printf("--------------------\n");
        printf("TRUE is: %d\n", true);
        printf("FALSE is: %d\n", false);
        printf("--------------------\n\n");

        XOR myXorGate;

        printf(" a b | x \n");
        printf("-----+---\n");

        for(int temp = 0; temp <=3; temp++)
        {
                a = temp & 0x02;
                b = temp & 0x01;
                //if (temp & 0x2)       a = true;
                //else a = false;
                //if (temp & 0x01) b = true;
                //else b = false;
                ////switch(temp)
                ////{
                ////    case 0:
                ////            a = false;
                ////            b = false;
                ////            break;
                ////    case 1:
                ////            a = false;
                ////            b = true;
                ////            break;
                ////    case 2:
                ////            a = true;
                ////            b = false;
                ////            break;
                ////    case 3:
                ////            a = true;
                ////            b = true;
                ////            break;
                ////}
                myXorGate.set(a, b);
                printf(" %d %d | %d\n", a, b, myXorGate.get());
        }
        printf("---------\n");
        return(0);
}
</code>
\\
**Makefile**\\
<code>
CXX = g++ $(CXXFLAGS) $(INC)
CXXFLAGS = -Wall
INC = -I ../../include/
SRC = xor.cc
OBJ = $(SRC:.cc=.o)
all: $(SRC) $(OBJ)

debug: CXX += -DDEBUG -g
debug: DEBUG = debug
debug: $(SRC) $(BIN)

.cc.o:
ifneq ($(MAKECMDGOALS),debug)
        @printf "[B]   %-20s ... " "$<"
        @$(CXX) -c $< && echo "OK" || echo "FAIL"
else
        $(CXX) -c $<
endif

clean:
        rm -f *.o $(OBJ) core
</code>
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