I have to create a control that can manipulate each "digit" of an integer value ( from 0
to 999,999
).
I know how to "Get" a digit of the integer - just Mod/Div -
public class IntegerModel{
private int _value = 0;
private int _GetValue( int baseValue, int modBy, int divBy ) =>
( baseValue % modBy ) / divBy;
public int Value => _this.Value;
public One => {
get => this._GetValue( this.Value, 10, 1 );
set => Console.WriteLine( "What do I put here?" );
}
public Ten{
get => this._GetValue( this.Value, 100, 10 );
set => Console.WriteLine( "What do I put here?" );
}
}
The problem is that I don't know how to eloquently SET the digit value.
If I was working in Binary it would be as simple as using some bitwise operators ( it may still be but I don't know exactly how to do it ).
So, ideally, if I were to, using this class, do the following, I would get the given output.
IntegerModel Foo = new IntegerModel( );
Foo.One = 7;
Foo.Ten = 3;
Console.WriteLine( Foo.Value ); //Output should be 37
What would I need to put in the One
and Ten
property setters to be able to achieve the desired behavior?
I suggest modular arithmetics for both set
and get
; another suggestion is to implement indexer in order to access n-th digit of the integer.
public class IntegerModel {
private int _value = 0;
private static int Power10(int value) {
return (int) Math.Pow(10, value);
}
public int Value {
get {
return _value;
}
}
//TODO: Implement ToString, Equals etc.
public int this[int index] {
get {
if (index < 0 || index > 6)
throw new ArgumentOutOfRangeException("index");
return (_value / Power10(index)) % 10;
}
set {
if (index < 0 || index > 6)
throw new ArgumentOutOfRangeException("index");
else if (value < 0 || value > 9)
throw new ArgumentOutOfRangeException("value");
_value = (index / Power10(index + 1)) * Power10(index + 1) +
value * Power10(index) +
_value % Power10(index);
}
}
}
If you insist on One
, Ten
etc. properties you can easily add them:
public int One {
get {return this[0];} // 0th digit
set {this[0] = value;} // 0th digit
}
public int Ten {
get {return this[1];} // 1st digit
set {this[1] = value;} // 1st digit
}
public int Hundred {
get {return this[2];} // 2nd digit
set {this[2] = value;} // 2nd digit
}
Test:
IntegerModel test = new IntegerModel();
// 987:
test[0] = 7; // Last (0th digit from the end)
test[1] = 8; // Middle (1st digit from the end)
test[2] = 9; // First (2nd digit from the end)
// 987
Console.WriteLine(test.Value);