string operations: looking for a specified letter

[ria3]

Hi,
How can I count the the number of times a specific letter like b occurs in a string?
Thank you!!!

[Ganon11]

How do you think you could do it? I could think of several ways.

[ria3]

lol, I have no idea... that's why I posted here :P I need some help!

[sandyw]

I'm a beginner myself.
I would use an if statement to find b's
along with What....
sandy

[ria3]

but.. how is that supposed to count it? And I don't know how many are in the string, the program is supposed to count that for me.

[Ganon11]

Well, you'd have to check each letter to see if it is a b - if it is, you can add 1 to a sum variable, and if not, don't do anything.

[hirak1984]

well just for hint...

we have a function named chatAt() in java...
try using that.

Hi,
How can I count the the number of times a specific letter like b occurs in a string?
Thank you!!!

[JosAH]

If anyone had read the API docs for the String class the indexOf() method
would've shown to be applicable for this job.

Here's a link to the API docs.

kind regards,

Jos

[BSCode266]

If you look closely in the class String, which obviously i would have done first if i didnt know how to, you will find that there is a method charAt(); this one should help you out, yes this was said before just with a typo in it.

BSCode266

[JosAH]

If you look closely in the class String, which obviously i would have done first if i didnt know how to, you will find that there is a method charAt(); this one should help you out, yes this was said before just with a typo in it.

BSCode266

I personally think that the indexOf method is better here, i.e. it keeps your
code simpler at no expense.

kind regards,

Jos

[hirak1984]

indexOf() definitely helps,but I think it will return the first occurence of the alphabet searched for?

am I correct?

I personally think that the indexOf method is better here, i.e. it keeps your
code simpler at no expense.

kind regards,

Jos

[JosAH]

indexOf() definitely helps,but I think it will return the first occurence of the alphabet searched for?

am I correct?

Nope, sorry; there's an overloaded version available. Here's the spoiler:

int count= 0;
for (int i= 0; (i= indexOf(yourString, i)) != -1); i++, count++);
return count;

kind regards,

Jos

[BSCode266]

You are right it does save you from working with booleans.

BSCode266

[Ganon11]

Nope, sorry; there's an overloaded version available. Here's the spoiler:

int count= 0;
for (int i= 0; (i= indexOf(yourString, i)) != -1); i++, count++);
return count;

kind regards,

Jos

O.o

very clever. I hadn't thought of that. Maybe I need to get more creative with my loops...:)

[JosAH]

O.o

very clever. I hadn't thought of that. Maybe I need to get more creative with my loops...:)

I'm just a bag full of tricks ;-)

kind regards,

Jos