how to find a vowel in a string using str.find

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lets say I have this sentence.

C#

string sSentence;
sSentence = "this is a string";

first thing I have to do in my program is to find the first vowel of each word.

for "this" the vowel is i.

is there a way for this function

str.find(key) can find this a,e,i,o,u ?

str.find(a || e || i || o || u);

please help thanks :))

Posted 18-Feb-15 5:06am

Reuben Cabrera

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Sergey Alexandrovich Kryukov 18-Feb-15 11:49am

Just a note: this is formulated as a problem "find an English vowel". There much more vowels in the world. What is it: std::string for native C++ or managed System.String for C++/CLI?
—SA

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CPallini · Answer 1 · 2015-02-18T05:10:00

Solution 1

There std::string class gently provides the find_first_of[^] method.

Posted 18-Feb-15 5:10am

CPallini

Comments

Reuben Cabrera 18-Feb-15 11:12am

uhm thank but i do not quite understand what it means. it was not taught to us. i wanna try and use str.find(___);

Ravi Bhavnani 18-Feb-15 11:16am

> it was not taught to us
That's a terrible attitude. Google it. You won't get far developing software if you don't research and experiment.

/ravi

Sergey Alexandrovich Kryukov 18-Feb-15 11:51am

Agree. This is the no-go attitude. It would be cheaper to give up engineering immediately, before having all this frustration and failures where such attitude can only lead. :-)
—SA

CPallini 18-Feb-15 11:26am

If you cannot use str::find_first_of (because your teacher wouldn't like it) then you have to separately call str::find for each of the vowvels and then take the minimum result (or, alternatively, write your own implementation of find_first_of function).

Reuben Cabrera 18-Feb-15 11:25am

well i kinda stated what I need. if there was a way to that with the function that I need then I might first try it before I go experimenting on other functions. Im also trying to learn on what other possibilities is there for str.find function.

Reuben Cabrera 18-Feb-15 11:26am

if there is no other way to use that function then just say it then that there is no possible way.

Reuben Cabrera 18-Feb-15 11:30am

ok i'll use the function that you suggested. sorry if I made a terrible statement.

Reuben Cabrera 18-Feb-15 11:36am

i clicked on your link. so here is my next question. what is std:: why does a statement start with that. what does it indicate?

CPallini 18-Feb-15 11:46am

std is the namespace of the standard C++ library. If you want to use any of the classes of the library then you have to prefix it with std:: (or alternatively, write the
using namespace std;
statement, see:
http://www.cplusplus.com/doc/tutorial/namespaces/
)

Reuben Cabrera 18-Feb-15 11:49am

what about this line?

while (found!=std::string::npos)

CPallini 18-Feb-15 12:07pm

From the linked page:
"Return value:
the position of the first character that matches.
If no matches are found, the function returns string::npos."

Reuben Cabrera 18-Feb-15 11:51am

oh ok. im using "using namespace std" on my program. no wonder it looks so different from the samples