C # Fundamentals, basic points of knowledge, arrays and collections, and code

Put a mind map of yourself first.

Then, write two code that you've knocked over.

Array Manager, collection Manager

  /*make an array parser * 1. Create an array * 2. Ascending order * 3. Output array * 4. Looking for odd number * 5. Finding prime numbers */            int[] nums; intLen; #regionCreate an array while(true) {Console.Write ("Please enter the length of the array (0-9999):"); Len=int.                Parse (Console.ReadLine ()); Nums=New int[Len]; if(Len >=0&& Len <=9999)                {                                        Break; }                Else{Console.WriteLine ("input error, enter continue input");                    Console.ReadLine ();                Console.clear (); }            }             for(inti =0; I < Nums. Length; i++) {Console.Write ("Please enter an array of"+ (i +1) +"Items:"); Nums[i]=int.            Parse (Console.ReadLine ()); }            #endregionconsole.clear (); #regionAscending order for(inti =0; I < Nums. Length-1; i++)            {                 for(intj = i +1; J < Nums. Length; J + +)                {                    if(Nums[i] >Nums[j]) {                        inttemp =Nums[i]; Nums[i]=Nums[j]; NUMS[J]=temp; }                }            }            #endregion            #regionOutput arrayConsole.WriteLine ("the array you entered is sorted as follows:");  for(inti =0; I < Nums. Length; i++) {Console.Write (Nums[i]+" ");                       } Console.WriteLine (); #endregion            #regionLooking for oddConsole.WriteLine ("among them, the following numbers are odd:");  for(inti =0; I < Nums. Length; i++)            {                if(Nums[i]%2!=0) {Console.Write (Nums[i]+" ");            }} Console.WriteLine (); #endregion            #regionLooking for prime numbersConsole.WriteLine ("where the following numbers are prime numbers:");  for(inti =0; I < Nums. Length; i++)            {                BOOLIsfind =false;  for(intj =2; J < Nums[i]; J + +)                {                    if(nums[i]%j==0) {Isfind=true ;  Break; }                                    }                if(!isfind) {Console.Write (Nums[i]+" "); }            }            #endregionConsole. ReadLine ();

/*Write a Collection Manager * Prompt menu and get user input menu options * Add data * Delete Data * Modify data * Ascending sort * Exit Program * Please select input (0-4)*/List<int> nums =Newlist<int>();  while(true)            {                #regionOutput Collection ContentsConsole.WriteLine ("the existing contents of the collection are as follows:"); Console.WriteLine ("==========================================================="); if(Nums. Count = =0) {Console.WriteLine ("no content in collection"); }                Else                {                    //traversing the output collection                    foreach(intIteminchnums) {Console.Write (item+"\ t");                } Console.WriteLine (); } Console.WriteLine ("==========================================================="); #endregion                #regionPrompt menu, and get user-entered menu optionsConsole.WriteLine ("1. Add Data"); Console.WriteLine ("2. Delete Data"); Console.WriteLine ("3. Modify the Data"); Console.WriteLine ("4. Sort in ascending order"); Console.WriteLine ("0. Exit the program"); Console.Write ("Please select (0-4):"); intinput =int.                Parse (Console.ReadLine ()); #endregion                #regionAccording to the user's input, do different processingif(Input = =0)                {                     Break;//exit loop, end of program                }                Else if(Input = =1) {Console.Write ("Please enter the number you want to add:"); intn =int.                    Parse (Console.ReadLine ()); Nums.                ADD (n); }                Else if(Input = =2) {Console.Write ("Please enter the number you want to delete (only the first occurrence is deleted):"); intn =int.                    Parse (Console.ReadLine ()); Nums.                Remove (n); }                Else if(Input = =3)                {                    if(Nums. Count = =0) {Console.Write ("no data in the collection can be modified, press ENTER to continue");                    Console.ReadLine (); }                    Else                    {                        intMaxindex =Nums.                        Count; Console.Write ("Please enter the number of items to modify ("+1+"-"+ (Maxindex) +"):"); intn =int.                        Parse (Console.ReadLine ()); if(N <0|| n >Maxindex) {Console.Write ("input Error, please enter the correct number of items, press ENTER to continue");                        Console.ReadLine (); }                        Else{Console.Write ("Please enter the new data:"); intNewnum =int.                            Parse (Console.ReadLine ()); Nums[n-1] =Newnum; }                    }                }                Else if(Input = =4)                {                     for(inti =1; I < Nums. Count-1; i++)                    {                         for(intj = i +1; J < Nums. Count; J + +)                        {                            if(Nums[i] >Nums[j]) {                                inttemp =Nums[i]; Nums[i]=Nums[j]; NUMS[J]=temp; }                        }                    }                }                Else{Console.Write ("input Error, please re-enter, press ENTER to continue");                Console.ReadLine (); }                #endregionconsole.clear (); }

C # Fundamentals, basic points of knowledge, arrays and collections, and code