C++ Programming toupper() and tolower() strings help?

Question

So i'm a little new to programing and i', doing a small hangman program but i'm having trouble figuring out how to ignore the user inputs case sensitivity.... If that makes sense?

For an example, if the word they're trying to solve is 'American Airlines' , the user enters the letter a, it will only count the a next to c and n.

However, if they enter A, then it will only count for the first letter A in both words.

How can I program it to where if the user inputs 'a', it recognizes both capitalized and lowercase letters in the word?

I know i have to use the toupper() and tolower() functions but i'm not really sure where to put them or code them. (still a noob).

This is what i have so far:

cout << "Phrase to guess: ";

cout << GuessWord << endl;

cout << "Enter a letter: ";

cin >> Letter;

Location = SecretWord.find(Letter,0);

if (Location > SecretWord.size())

BadGuesses++;

else

while (Location < SecretWord.size())

{

GuessWord.replace(Location,1,Letter);

char a='A';

a=toupper(a);

Location = SecretWord.find(Letter, Location + 1);

}

cpcii · Answer

Try finding the ASCII value of the letter and if it falls into the range for upper case, add 32 to it and convert it back to a letter and test your table.

http://www.asciitable.com/

Use your text to find out how to cast a char (hint hint).

cja · Answer

For the phrase to guess, change all letters to lowercase:

void toLower(string &s) {
. . string::iterator i = s.begin();
. . while (i != s.end()) {
. . . . *i = tolower(*i);
. . . . ++i;
. . }
}

... and also use tlower() to convert characters as they're entered. Of course, you could go all uppercase as well.

You can also use for_each, from <algorithm>:

void chToLower(char &c) {
. . c = tolower(c);
}

string toLower(const string &s0) {
. . string s1 = s0;
. . for_each(s1.begin(), s1.end(), chToLower);
. . return s1;
}

? · Answer

easy: #include char Letter; //be sure that Letter is a single character NOT a string ... cout << "Enter a letter: "; cin >> Letter; Letter=toupper(Letter);

jzimmerman56301 · Answer

make all your puzzle answers in uppercase.

Then set your Letter Variable = letter.toupper().

then find your location.

C++ Programming toupper() and tolower() strings help?

4 Antworten