Datatypes in c#

Question

I am in need of an integer data type which starts with 00 from 1 to 10 and 0 from 10 to 99.

Is there any data type in c#

Thank you very much....

Answer 1

You can use pretty much any integer type for that( int , uint , etc); the important part is how you format it. In this case:

string s = i.ToString("000");

The integer data type is just the value - leading zeros don't exist or not exist - simply that isn't the job of an integer.

You could always create a custom struct of course, taking the integer value in the constuctor (and maybe a custom conversion operator), overriding the ToString() method (and probably Equals , GetHashCode , etc).

---

Just for kicks:

public struct TriDigit : IComparable, IComparable<TriDigit>, IComparable<int>, IEquatable<TriDigit>, IEquatable<int>
{
    private readonly int value;
    public TriDigit(int value)
    {
        if (value < 0 || value > 999) throw new ArgumentOutOfRangeException("value");
        this.value = value;
    }
    public override string ToString()
    {
        return value.ToString("000");
    }
    public override bool Equals(object obj)
    {
        if (obj == null) return false;
        if (obj is TriDigit) return ((TriDigit)obj).value == value;
        if (obj is int) return ((int)obj) == value;
        return false;
    }
    public int CompareTo(object obj)
    {
        if (obj == null) return -1;
        if(obj is TriDigit) return value.CompareTo(((TriDigit)obj).value);
        if (obj is int) return value.CompareTo((int)obj);
        return -1;
    }
    public override int GetHashCode()
    {
        return value;
    }
    public static explicit operator TriDigit(int value)
    {
        return new TriDigit(value);
    }
    public static implicit operator int(TriDigit value)
    {
        return value.value;
    }

    int IComparable<TriDigit>.CompareTo(TriDigit other)
    {
        return value.CompareTo(other.value);
    }
    int IComparable<int>.CompareTo(int other)
    {
        return value.CompareTo(other);
    }
    bool IEquatable<TriDigit>.Equals(TriDigit other)
    {
        return value == other.value;
    }
    bool IEquatable<int>.Equals(int other)
    {
        return value == other;
    }
}

Answer 2

听起来您需要格式字符串，而不是数据类型。

Console.WriteLine("{0:D3}", i);

Answer 3

You can simply use int or if it must not be negative uint (unsigned integer). There are smaller data types, but for most applications they're not worth worrying about.

Answer 4

If you are saying that you need an integer with a legal range from 1 to 10, with an index that starts at zero, then the answer is no. You'll need to make your own an ADT for that.

Answer 5

It's formatting you want, not a new datatype. Read all about it here: MSDN's page on Custom Numeric Format Strings .

Answer 6

You can use PadLeft(int totalWidth, char paddingChar) like..

int myNumber=12
string myStringNumber = myNumber.ToString().PadLeft(3, '0');