Capital Letters?

My program is supposed to read in strings and compare them to words in a "dictionary" (basically a spell checker). However, if a word starts with a capital letter, I'm supposed to change that letter to a lower case letter and check the word again.

How would I change just one letter in the string? I know how to change an individual letter, but I'm a bit lost when it comes to strings...

One way would be to walk along the string with a pointer and check if each letter is upper or lower.

If char word[] is your word, then the first letter is word[0]. (The same is true even if it's char *word.)

So it would be something like this?

Code:

---

void uppercase(char* checkword)
{
    char c = 'N';
   
    if(checkword[0] == isupper(c))
        tolower(c); 
}

---

Well, let's step through that, shall we?

Code:

---

char c = 'N';

---

We define a variable c, which has value 'N'.

Code:

---

if(checkword[0] == isupper(c))

---

isupper(c) will be 1, since c is 'N' and isupper('N') is true. So if the first letter in the checkword string has ASCII value 1 (a/k/a smiley face), then we will do

Code:

---

tolower(c);

---

nothing (well, we will call tolower on our temporary variable c, which will return the value of 'n', which we will then promptly ignore).

Well, I changed some stuff around to make a little better sense, but I'm still not getting anything to change...

I don't think I'm quite seeing what's going wrong.

Code:

---

void uppercase(char* checkword)
{
    char c = checkword[0];
   
    if(isupper(c))
        tolower(c);
}

---

You're not storing the value returned by tolower().

There is nothing wrong with using pointers :), ie 'c' is not required.

Well, again, throwing the answer away is very likely going to lead to nothing changing. If you want tolower(c) to go somewhere, put it there (by assigning it to the proper place).

Oh! Alright, sorry about that, I get it now.

Thanks!