/*
C#: The Complete Reference
by Herbert Schildt
Publisher: Osborne/McGraw-Hill (March 8, 2002)
ISBN: 0072134852
*/
// Create a 4-bit type called Nybble.
using System;
// A 4-bit type.
class Nybble {
int val; // underlying storage
public Nybble() { val = 0; }
public Nybble(int i) {
val = i;
val = val & 0xF; // retain lower 4 bits
}
// Overload binary + for Nybble + Nybble.
public static Nybble operator +(Nybble op1, Nybble op2)
{
Nybble result = new Nybble();
result.val = op1.val + op2.val;
result.val = result.val & 0xF; // retain lower 4 bits
return result;
}
// Overload binary + for Nybble + int.
public static Nybble operator +(Nybble op1, int op2)
{
Nybble result = new Nybble();
result.val = op1.val + op2;
result.val = result.val & 0xF; // retain lower 4 bits
return result;
}
// Overload binary + for int + Nybble.
public static Nybble operator +(int op1, Nybble op2)
{
Nybble result = new Nybble();
result.val = op1 + op2.val;
result.val = result.val & 0xF; // retain lower 4 bits
return result;
}
// Overload ++.
public static Nybble operator ++(Nybble op)
{
op.val++;
op.val = op.val & 0xF; // retain lower 4 bits
return op;
}
// Overload >.
public static bool operator >(Nybble op1, Nybble op2)
{
if(op1.val > op2.val) return true;
else return false;
}
// Overload <.
public static bool operator <(Nybble op1, Nybble op2)
{
if(op1.val < op2.val) return true;
else return false;
}
// Convert a Nybble into an int.
public static implicit operator int (Nybble op)
{
return op.val;
}
// Convert an int into a Nybble.
public static implicit operator Nybble (int op)
{
return new Nybble(op);
}
}
public class NybbleDemo {
public static void Main() {
Nybble a = new Nybble(1);
Nybble b = new Nybble(10);
Nybble c = new Nybble();
int t;
Console.WriteLine("a: " + (int) a);
Console.WriteLine("b: " + (int) b);
// use a Nybble in an if statement
if(a < b) Console.WriteLine("a is less than b\n");
// Add two Nybbles together
c = a + b;
Console.WriteLine("c after c = a + b: " + (int) c);
// Add an int to a Nybble
a += 5;
Console.WriteLine("a after a += 5: " + (int) a);
Console.WriteLine();
// use a Nybble in an int expression
t = a * 2 + 3;
Console.WriteLine("Result of a * 2 + 3: " + t);
Console.WriteLine();
// illustrate int assignment and overflow
a = 19;
Console.WriteLine("Result of a = 19: " + (int) a);
Console.WriteLine();
// use a Nybble to control a loop
Console.WriteLine("Control a for loop with a Nybble.");
for(a = 0; a < 10; a++)
Console.Write((int) a + " ");
Console.WriteLine();
}
}
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