SELECT statement----Switch case

The switch case where you learned the choice statement today is a multi-select scenario that you can use.

Case:

Enter the month and the number of the output is how many days this year
The 1,3,5,7,8,10,12 month is 31 days a year.
This year's February is 28 days the other is 30

            intM1 = to, M2 = -, M3 = to, M4 = -, M5 = to, M6 = -, M7 = to, M8 = to, M9 = -, M10 = to, M11 = -;            ----don't need to define the volume for December, because Console.Write ("Please enter the month:"); intm =int.            Parse (Console.ReadLine ()); Console.Write ("Please enter the date:"); intD =int.            Parse (Console.ReadLine ()); Switch(m)-------Once there is a match, one of them is executed, the others are not executed, and no match goes to default. Break means to jump out of a selection.             {                 Case 1: Console.WriteLine ("today is the first of the year"+ D +"days. ");  Break;  Case 2: Console.WriteLine ("today is the first of the year"+ (M1 + D) +"days. ");  Break;  Case 3: Console.WriteLine ("today is the first of the year"+ (M1 + m2 + d) +"days. ");  Break;  Case 4: Console.WriteLine ("today is the first of the year"+ (m1 + m2 + m3 + d) +"days. ");  Break;  Case 5: Console.WriteLine ("today is the first of the year"+ (m1 + m2 + m3 + m4 + D) +"days. ");  Break;  Case 6: Console.WriteLine ("today is the first of the year"+ (m1 + m2 + m3 + M4 + M5 + D) +"days. ");  Break;  Case 7: Console.WriteLine ("today is the first of the year"+ (m1 + m2 + m3 + M4 + M5 + M6 + D) +"days. ");  Break;  Case 8: Console.WriteLine ("today is the first of the year"+ (m1 + m2 + m3 + M4 + M5 + M6 + M7 + D) +"days. ");  Break;  Case 9: Console.WriteLine ("today is the first of the year"+ (m1 + m2 + m3 + M4 + M5 + M6 + M7 + m8 + D) +"days. ");  Break;  Case Ten: Console.WriteLine ("today is the first of the year"+ (m1 + m2 + m3 + M4 + M5 + M6 + M7 + m8 + M9 + D) +"days. ");  Break;  Case  One: Console.WriteLine ("today is the first of the year"+ (m1 + m2 + m3 + M4 + M5 + M6 + M7 + m8 + M9 + M10 + D) +"days. ");  Break;  Case  A: Console.WriteLine ("today is the first of the year"+ (m1 + m2 + m3 + M4 + M5 + M6 + M7 + m8 + M9 + M10 + M11 + D) +"days. ");  Break; default: Console.WriteLine ("your input is incorrect. ");  Break; }

Case: (Thought for a long time, this question.) ）

Enter a year, month, and day. See if the format is correct.

Console.Write ("Please enter a year:"); intYear =int.            Parse (Console.ReadLine ()); if(Year <=9999&& year >0) {Console.Write ("Please enter a month:"); intm =int.                Parse (Console.ReadLine ()); if(M <= A&& m >=1) {Console.Write ("Please enter a date:"); intD =int. Parse (Console.ReadLine ());                    --------from here to up very simple, to the following choice statement card. if(M = =1|| m = =3|| m = =5|| m = =7|| m = =8|| m = =Ten|| m = = A-------began to be written here (D<=31&&d>=1) later reacted to the wrong, haha {if(d >=1&& D <= to) {Console.WriteLine ("input format is correct"); }                        Else{Console.WriteLine ("you have entered an incorrect format. "); }                    }                    Else if(M = =4|| m = =6|| m = =9|| m = = One)                    {                        if(d >=1&& D <= -) {Console.WriteLine ("input format is correct"); }                        Else{Console.WriteLine ("you have entered an incorrect format. "); }                    }                    Else                    {                        if(Year%4==0&& Year% -!=0) || (Year% -==0))//judge leap years, know the law of Leap year is good to write, four A leap, a century does not leap, 400 years again leap. {The year is a full hundred, it must be a multiple of 400 is a leap years; not 40.                            A multiple of 0 years, even a multiple of 4 is not a leap year. if(d >=1&& D <= in) {Console.WriteLine ("input format is correct"); }                            Else{Console.WriteLine ("you have entered an incorrect format. "); }                        }                        Else                        {                            if(d >=1&& D <= -) {Console.WriteLine ("input format is correct"); }                            Else{Console.WriteLine ("you have entered an incorrect format. "); }                        }                    }                }                Else//Month not 1~12{Console.WriteLine ("you have entered an incorrect format. "); }            }            Else//not 9999~0 .{Console.WriteLine ("you have entered an incorrect format. "); }

SELECT statement----Switch case