Basic C++ problems

Your problem is that you are using i before checking it, at the bottom of the loop.

Normally this loop would look like

Code:

i = 0;
while (i < wordsize)
{
  ch = word.at(i);
... if vowel ... blah blah...
  i++;
}

I don't know if you're supposed to know "for" loops yet, but if you do, the canonical form would be:

Code:

for (int i = 0; i < wordsize; i++)
{
  ch = word.at(i);
  .... checking ch ...
}