finding position of a character in a string

Question

2.75/5 (4 votes)

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hello guys.
i have a question, how can we find out position of a character in a string value.
like i type arun in a textbox, then i type 'u' in next textbox.
then on the click of buttn it displays the position of 'u' in 'arun'.
thanx for ur valuable suggestion ,but there is still a problum,
wt will we do if a character is repetation itself and we need to find out find out it position everytime.like position of 'a 'in 'ajay' is at index 0 and 2 .wt should i do to find both positions

Posted 29-Nov-10 19:25pm

pawanvats

Updated 29-Nov-10 21:24pm

v3

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5 solutions

Solution 2

On the click event of the button, Write this:

C#

String myName=TextBox1.Text;
String findCharacter=TextBox2.Text;

Int myCharacterIsAt=myName.IndexOf(findCharacter,1);
//It will return the index staring from zero.
// ie. in case of "u" you will get 2 as index

//Display the result
TextBox3.Text=myCharacterIsAt + 1; // Will return 3 in your example

Posted 29-Nov-10 20:02pm

Tarun.K.S

Solution 3

Since the question changed, so will the answer!

Well i would be using a for loop.

C#

int i=0;
String myName=TextBox1.Text;
String findCharacter=TextBox2.Text;

for(i=0;i<myname.length;i++)>
{
 if(myName[i]==findCharacter)
 {
  TextBox3.Text=(i+1) + " ";
 }
}

Posted 29-Nov-10 22:22pm

Tarun.K.S

Updated 29-Nov-10 22:35pm

v2

Solution 5

Hi,

Try the following Code...

string sText = "AJAY";
string sIndex=string.Empty;

for(int a=0;a<sText.Length;a++)
{
  if(sText[a].ToString().Equal("A"))
  {
    if(sIndex != string.Empty)
    {
      sIndex += ",";
    }   
    sIndex += (a+1);
  }
}

// Get sIndex value is your output.

Cheers :)

Posted 29-Nov-10 22:45pm

T.Saravanann

Updated 29-Nov-10 22:48pm

v2

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Sandeep Mewara · Accepted Answer · 2010-11-29T19:55:00

Solution 1

So, what is the issue?

On click of button, get the text present in textbox2 and use it to search in text of textbox1. You can use one of various properties based on your need. Like IndexOf, etc. Have a look at the properties of string here.[^]

Posted 29-Nov-10 19:55pm

Sandeep Mewara

R. Erasmus · Accepted Answer · 2010-11-29T22:30:00

Try this out: :-D

C#

public partial class Form1 : Form
{
  // declaration of variables
  string text = "";
  char character;
  int charPos = 0;
  string strCharPos;

  public Form1()
  {
    InitializeComponent();
  }

  private void button1_Click(object sender, EventArgs e)
  {
    // data
    text = textBox1.Text;
    // search criteria
    character = Convert.ToChar(textBox2.Text);

    // find character
    for (int idx = 0; idx < text.Length; idx++)
    {
      if (text[idx] == character)
      {
        charPos = idx + 1;
        strCharPos = strCharPos + Convert.ToString(charPos) + ", ";
        label1.Text = strCharPos;
      }
    }

    // Reset data
    strCharPos = "";
    charPos = 0;
    text = "";
    character = '\0';
  }
}