using while(cin)

help, i've spent many a desperate compile trying to tweak this code to get it to run but can't get it to work. The code looks like this:

Code:

---

char letter;

while(cin)
{
cin>>letter;
// do some stuff
}

---

the purpose of the code is to pull in whatever the user types one character at a time and when they hit enter to process it. The problem is that when I try it and i hit enter it just moves the cursor down one line and waits.

edit...

Your're never outputting anything, so it's waiting for input like you told it to do so.

Code:

---

char letter;

while(cin && letter != 'q')
{
    cout<<"Enter a character: ";
    cin>>letter;
    cout<<"You entered "<<letter<<endl;
}

---

I understand that, but is there a way to let the person type more then one character, say a sentence and then when they hit enter to let me process it one character at a time? I've thought of using the getch() function in conio.h but I've run into problem that if they make a mistake and need to hit backspace. I want to give them the freedom to type freely until they want to stop, at which time they press enter.

Code:

---

#include <iostream>
using namespace std;

int main(void)
{
char* myStr = new char;
cin>>myStr;
cout<<myStr;
}

---

And if you need to edit it character by character you can just loop through the array or something:

Code:

---

for (int i=0;myStr[i]!='\0';i++)
 //do something with myStr[i]

---

You can read in the whole sentence using cin.getline(), and then process the variable containing the sentence char by char.

Quote:

---

Originally posted by JaWiB

Code:

---

#include <iostream>
using namespace std;

int main(void)
{
char* myStr = new char;
cin>>myStr;
cout<<myStr;
}

---

---

*cough*Free Memory*cough*

ERg always forget...

*cough* You also allocate only one byte for the buffer *cough*

*cough* Forgot to return 0 *cough*

*cough* Not to mention it won't work if the user enters multiple words. *cough*

Quote:

---

*cough* Forgot to return 0 *cough*

---

Nope don't have to :)

*cough* Ok that's enough *cough*

The cin works the same way as a file stream. That is to say, the expression cin >> ??? would return true until you have pressed Ctrl-Z (EOF) and Enter.

Code:

---

#include <iostream>
#include <cstdlib>
#include <conio.h>

using namespace std;

int main(std::string argv , int argc) {

string yourName = "doodlepoodle";

while( (getch())  && (getch() != 'q') ) //get input. input shouldn't be 'q' or else quits.
 {
 cout << "hello "  << yourName << "\n"; // prints hello "yourName".
 }                                                                                                  // but dont forget to
 system("pause");                                                            // press "enter" in
 }                                                                                                // the console
       
//The problem with this code is however that it asks for input two times.
// i.e to quit i have to press 'q' as last one .

---