public static void Main()
double Chapter1,Chapter2,Chapter3,CalculatesTheFirstSemesterMark,TheMarkForTheSecondSemesterIsCalculated,TheScoreForTheThirdSemesterIsCalculated;
Console.WriteLine("ادخل قيمة Chapter1");
Chapter1 =double.Parse(Console.ReadLine());
Console.WriteLine(" Chapter2 ادخل قيمة ");
Chapter2 =double.Parse(Console.ReadLine());
Console.WriteLine(" Chapter3 ادخل قيمة ");
Chapter3 =double.Parse(Console.ReadLine());
CalculatesTheFirstSemesterMark=Chapter1/40;
Console.WriteLine("the CalculatesTheFirstSemesterMark is{0}",CalculatesTheFirstSemesterMark );
TheMarkForTheSecondSemesterIsCalculated=Chapter2/20;
Console.WriteLine("the TheMarkForTheSecondSemesterIsCalculated is{0}",TheMarkForTheSecondSemesterIsCalculated );
TheScoreForTheThirdSemesterIsCalculated =Chapter3/40;
Console.WriteLine("the TheScoreForTheThirdSemesterIsCalculated is{0}",TheScoreForTheThirdSemesterIsCalculated );