. NET Study notes----2015-07-08 (Basic review and Exercise 02)

Printing multiplication Tables

A quick look at the one-month video, is not ah, practice too little, in order to print out a triangular table, and special tangled half an hour, and finally Baidu just know, good weak ....

        Static voidMain (string[] args)            {chengfatable ();        Console.readkey (); }        /// <summary>        ///Output Multiplication Table/// </summary>        Static voidchengfatable () {//i*j = n            intI, J;  for(i =1; I <=9; i++)            {                 for(j =1; J <= I; J + +) {Console.Write ("{0}*{1}={2}\t", I, J, I *j);            } Console.WriteLine (); }        }

Defines an array of length, randomly assigns a value to the array, and allows the user to enter a number N, one line N number of output arrays     int[] array = new INT[50];  Random r = new Random (); R.next ();

The line wrapping method is tangled for a while:

Idea: When the subscript equals the number entered by the user, the n+1 is the first element in the array, where the line break is exactly 1 rows n elements

Yesterday Tangled try{}catch{} method really useful, tangled, solved, the impression is more profound

        Static voidMain (string[] args) {            int[] arr =New int[ -]; //int[] arr = new INT[5]; //for (int i = 0; i < arr. Length; i++)//{            //Console.WriteLine (Arr[i]); //}             while(true)//re-enter the user as soon as the error is entered, until it is correct            {                Try{Console.WriteLine ("are you going to print this array in a row of numbers? "); intUsernum =Convert.ToInt32 (Console.ReadLine ()); //Assign Value                    int[] NewArr =Fill (arr); //line break OutputNewLine (Usernum, NEWARR);  Break; }                Catch{Console.WriteLine ("input Error, please re-enter");        }} console.readkey (); }        /// <summary>        ///assigns a value to each element in the array/// </summary>        /// <param name= "n" >value</param>        /// <param name= "arr" >an array to be assigned a value</param>        ///returns an array of type integer        Static int[] Fill (int[] arr) {Random R=NewRandom ();  for(inti =0; I < arr. Length; i++)            {                                intn = R.next (0, -); Arr[i]=N; }            returnarr; }        /// <summary>        ///receives the number n to wrap the nth element of the array./// </summary>        /// <param name= "n" >n Number of user input</param>        Static voidNewLine (intNint[] arr) {             for(inti =0; I < arr. Length; i++)            {                //the user enters a number n and outputs an array by one row n number//If the user enters 5, then the line should be wrapped after the subscript (i) is 4                if(i = = n | | I% n = =0) {Console.WriteLine (); } console.write (Arr[i]+"\ t"); }        }

. NET Study notes----2015-07-08 (Basic review and Exercise 02)