Member Avatar for shadowrider

if i want to read some integer what command i must use
how to do i read and save value in multi dimensional array??

urgently needed:-|

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  • Latest Post Latest Post by ddanbe

Dani AI

Generated

The answers above show how to read a line and parse it, but both int.Parse and Convert.ToInt32 will throw on invalid input. A safer pattern is to keep prompting until the user enters a valid 32-bit integer using int.TryParse (docs).

static int ReadIntFromConsole(string prompt)
{
    for (;;)
    {
        Console.Write(prompt);
        var s = Console.ReadLine();
        if (int.TryParse(s, out var value))
            return value;
        Console.WriteLine("Please enter a valid integer.");
    }
}

// Fill a 2D array with integers read from the console
int rows = ReadIntFromConsole("Rows: ");
int cols = ReadIntFromConsole("Cols: ");
var grid = new int[rows, cols]; // C# multidimensional array

for (int r = 0; r < rows; r++)
    for (int c = 0; c < cols; c++)
        grid[r, c] = ReadIntFromConsole($"[{r},{c}] = ");

Note: int[,] is a true multidimensional array; indexing is grid[r, c]. This is different from a jagged array (int[][]), which is an array of arrays. See Multidimensional arrays in C#.

If you are in ASP.NET, there is no keyboard/console. Read values from form fields (e.g., Request.Form["rows"]) and validate with int.TryParse, or use model binding with validation attributes. For multithreaded scenarios, avoid reading from the console on multiple threads, and synchronize writes to a shared array (e.g., with lock, docs).

Recommended Answers

All 12 Replies

Member Avatar for Ancient Dragon

maybe this short tutorial will help you. Follow the link near the bottom of the page for other tutorials.

Member Avatar for shadowrider

maybe this short tutorial will help you. Follow the link near the bottom of the page for other tutorials.

that link is telling how to read from a file I want to know how to read from keyboard.
Like we have have cin command in c++ and scanf in C

Member Avatar for blacklocist

If your using a Console app it should be

string strTemp = Console.Readline()

Member Avatar for shadowrider

If your using a Console app it should be

string strTemp = Console.Readline()

but i said i wanted to read integer tht will read integer as character

Member Avatar for campkev

int intTemp = Convert.ToInt32(Console.Readline())

Member Avatar for shadowrider

int intTemp = Convert.ToInt32(Console.Readline())

i have also found one other way that is
int n= int.Parse(Console.ReadLine());
thanks pal that is great

Member Avatar for blacklocist

Crap forgot that he wanted a integer and not a string. :)

Member Avatar for shadowrider

Crap forgot that he wanted a integer and not a string. :)

no prob it is done now thanks for answering;)

Member Avatar for adem87

hey these codes are working you can debug and use
int sum = 7;
Console.WriteLine("enter an integer for adding");

int a = int.Parse(Console.ReadLine());

sum += a;

Console.WriteLine(sum);

Member Avatar for sanjeevib 
int no=(int)Convert.ToInt32(Console.ReadLine());

this ll also work

Member Avatar for Jeya Rani

must given input in integer without string..how is it possible in c#?suppose user given input in string how can i manage?

Member Avatar for ddanbe

Hi Jeya Rani, welcome to DaniWeb.
First: Don't resurrect old threads.
Start a new thread with your question and refer to this thread with a link, if you want to.
To answer you question, try this:

        /// <summary>
        /// Read an integer from the console
        /// Return 0 if no success(perhaps MaxInt?)
        /// </summary>
        /// <param name="prompt">descriptive message</param>
        /// <returns>an integer</returns>
        public int readInt(string prompt)
        {
            Console.Write(prompt);
            string line = Console.ReadLine();
            int quantity;
            if (int.TryParse(line, out quantity) == false)
            {
                quantity = 0;
            }
            return quantity;
        }
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