C#

ishaq shinwari wrote:

i'm a new user and want to develop a mobile software in C#...

public abstract class NumericBase<T> where T : struct {
        public static NumericBase<T> operator + (NumericBase<T> pA, NumericBase<T> pB) {
            return pA.Add(pB);
        }
        public static NumericBase<T> operator - (NumericBase<T> pA, NumericBase<T> pB) {
            return pA.Sub(pB);
        }
        public abstract T Value { get; set; }
        public abstract NumericBase<T> Add(NumericBase<T> pOther);
        public abstract NumericBase<T> Sub(NumericBase<T> pOther);
    }

public class NumericInt : NumericBase<int> {
        public NumericInt() : this(0) {}

        public NumericInt(int pValue) {
            Value = pValue;
        }
        public override int Value { get; set; }
        public override NumericBase<int> Add(NumericBase<int> pOther) {
            return new NumericInt(Value + pOther.Value);
        }
        public override NumericBase<int> Sub(NumericBase<int> pOther) {
            return new NumericInt(Value - pOther.Value);
        }
    }

public class MySummator<T> 
        where T : struct {

        public NumericBase<T> Result { get; set; }

        public void Foo(NumericBase<T> pParameter) {
            Result = Result + pParameter;
        }

System.Security.Principal.WindowsIdentity.GetCurrent().Name