Problem With Using Elements Of An String

Question

i have this code for example:

string i = "100";

if(i[1]==0)
{
    MessageBox.Show("ok");
}

and I thought I should get "ok" but it doesnt work. What is i[1] here?

For this situation, i[1] is the character 0. You're comparing a char against an int. The number equivalent of the character 0 is 48. Since 0 == 48 is false, no alert is displayed. — Cᴏʀʏ
– Cᴏʀʏ, Commented Sep 21, 2011 at 18:43

Justin Niessner · Accepted Answer · 2011-09-21 18:43:24Z

6

Your comparison is using the wrong type. When you use an indexer with a string, the result is a char. Your if statement is using an int. You need to change your code to:

if(i[1] == '0')
{
    MessageBox.Show("Ok");
}

answered Sep 21, 2011 at 18:43

Justin Niessner

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Comments

Dave · Accepted Answer · 2011-09-21 18:43:26Z

5

You're comparing a string to an integer.

Try if (i[1] == '0').

answered Sep 21, 2011 at 18:43

Dave

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Comments

Mark Cidade · Accepted Answer · 2011-09-21 18:43:16Z

2

i[1] is a char of '0' (Unicode U+0030), which is different than (int) 0.

answered Sep 21, 2011 at 18:43

Mark Cidade

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Comments

Praveen · Accepted Answer · 2011-09-21 18:44:45Z

1

char i[0] is compared against an integer

answered Sep 21, 2011 at 18:44

Praveen

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Comments

Jamiec · Accepted Answer · 2011-09-21 18:43:37Z

0

i[1] is the second character in the string, as arrays in c# are zero-based.

answered Sep 21, 2011 at 18:43

Jamiec

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1 Comment

Anson Over a year ago

That's not what OP was asking. i[1] is a perfectly valid index into his string of length 3.

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