01Net Foundation strengthens the first day-Foundation strengthening little exercises

1 usingSystem;2 usingSystem.Collections.Generic;3 usingSystem.Linq;4 usingSystem.Text;5 usingSystem.Threading.Tasks;6 7 namespacePractice18 {9     class ProgramTen     { One--------------------------------------------------------------------------------------- A #使用一般方式, Exchange values for two variables -        Static voidMain (string[] args) -         { the             #regionDeclaration of two variables: int n1=10, n2=20; Requires the exchange of two variables, the last output n1=20,n2=10, the extension (*): Do not use a third variable how to Exchange? -             intN1 =Ten, N2 = -; -       - #常规的交换数据方式 +             inttemp=N1; -n1=N2; +N2=temp; A      at #数学技术来交换数据方式 -N1 = n1 +N2; -N2 = N1-N2; -N1 = N1-N2; -  -Console.WriteLine ("n1="+N1);  inConsole.WriteLine ("n2="+n2); - Console.readkey (); to  +             #endregion -         } the------------------------------------------------------------------------------------ * #使用封装, to handle the value exchange of two variables $         Static voidMain (string[] args)Panax Notoginseng         { -             #regionUse the method to achieve: encapsulate a method to do, the method has two parameters for num1,num2, the NUM1 and num2 Exchange. Hint: The method has two parameters N1, N2, in the method to exchange N1 with N2, using ref (*) the  +             intN1 =Ten, N2 = -; A  theSwap (refN1,refn2); +  -Console.WriteLine ("n1="+N1);  $Console.WriteLine ("n2="+n2); $ Console.readkey (); -  -             #endregion the         } - Wuyi         Private Static voidSwap (ref intN1,ref intn2) the         { -             //throw new NotImplementedException (); Wu             intTMP =N1; -N1 =N2; AboutN2 =tmp; $         } --------------------------------------------------------------------------------------- -     } - } A     

01Net Foundation strengthens the first day-Foundation strengthening little exercises