Trying to extract words

[Nen013]

So I'm trying to create a function that will extract a word from a string. I'm trying to do this without creating an array. So far I have this:

string s = "Hello World";
string t;
for (size_t k = 0; k!=s.size(); k++)
{if (isalpha(s[k]))
t+=s[k];
else
???;
}
cout << t << endl;

Basically I'm wondering what to put in the ??? part. Because I want the program to stop taking in characters once it hits a non-letter character.

Or is there any easy method of doing this?

[whodgson]

What is s[k]....an array?
Also what is size_t defined as ....an int?
Which word do you wish to 'extract' ......the first word, the fourth word or some specific word like "?????" ?
Are you intending to print the string, pick the word to extract then extract it? or are you just intending to nominate a word like "thermocouple" and if it happens to be in the string censor it?
Are vectors also banned?..... because you can delete an element from a vector.
Sorry this is so unhelpful

[sumeshnb]

you can put a break statement in place of ????, so that the program will break from the for loop .

string s = "Hello World";
string t;
for (size_t k = 0; k!=s.size(); k++)
{if (isalpha(s[k]))
t+=s[k];
else
break;
}
cout << t << endl;

[weaknessforcats]

You need to write down your algorithm first. Then code it.

Maybe:

1) remove whitespace
2) move characters to your word until a) you hit whitespace or b) you run out of input.
3) repeat from 1 ofer the next word.