Beginner giving question about cin another try :-)

Hi!

I would like to know if there is any way in C++ to scan the keyboard without having to press the Enter key?

c=cin.get; // doesn't work
c=cin.get(); // waits for the Enter key

Thanks
Johan

cin.getch( ) doesnt wait for the enter key. Or so I've been told...

why not use getch()?

getch() halts the program until a key is pressed.
kbhit() is excellent but it doesn't tell you WHICH key was pressed and I haven't figured out how to reset kbhit() from 1 (which was the value when it was pressed) back to 0.

I really need an answer to this so if there is anyone who can help me I would be thankful.

/Johan

Just use it like this (I'm at school right now so I have not compiled this but I think it will work fine)
I hope this helps you guys out a bit ^_^

Code:

---

#include <stdlib.h>
#include <stdio.h>
#include <dos.h>                                    //Not really sure if you
                                                                //Need to include dos.h

int main()
{
 printf("Looping press q to quit.\n");        //Message.
 bool running=true;                                  //Make running true
 int n;                                                      //make counter var.
 char k;                                                    //if the prog does not
                                                                //run make this int.
 while(running)                                        //Loop while running.
 {
  if(!kbhit())                                              //Wait for user to hit kb.
  {
  k=getch();                                            //Get user input.
  switch(k)                                                //Look at input.
  {
    case "q":                                            //User wants to quit.
      running=false;                                  //Quit.
    break;                                                //Done with switch.
  }
 }
n++;                                                        //add to counter.
printf("Looped %d times\n",n);              //Show counter.
}
 return 0;
}

---

Sorry if there are any errors I don't have a compiler to test on at school right now. ^_^

few problems I think I've fixed:

Code:

---

#include <stdlib.h>
#include <stdio.h>
#include <conio.h>
#define TRUE 1
#define FALSE 0

int main()
{
 int running=TRUE;                                  //Make running true
 int n = 0;                                                      //make counter var.
 char k;                                                    //if the prog does not
 printf("Looping, press q to quit.\n");        //Message.
 while(running)                                        //Loop while running.
 {
  if(kbhit())                                              //Wait for user to hit kb.
  {
  k=getch();                                            //Get user input.
  switch(k)                                                //Look at input.
  {
    case 'q':                                            //User wants to quit.
      running=FALSE;                                  //Quit.
    break;
  }                                              //Done with switch.
  }
  n++;                                                        //add to counter.
  printf("Looped %d times\n",n);              //Show counter.
 }
 return 0;
}

---

Edit - works now

Excellent post :)

I have a question now...

By combining kbhit( ) and getch( ) while switching what the user entered, how would you catch the UP or LEFT arrow being hit? I did a test program to see what # and character they outputted and each arrow key (UP, LEFT, RIGHT, & DOWN) outputted 224 and the character for the greek alpha. Then it locks up the program.

Here is the code I used to test it out (pretty much same as above):

Code:

---

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

using namespace std;

void goodbye(void) { cout << "Goodbye!\n"; }

int main()
{
  int running = 1;
  int c;

  while( running )
  {
      if( !kbhit() )        // If the keyboard hasn't been hit..
      {
        c = getch();        // Snatch the character from user

        cout << (int)c << " " << (char)c << endl;

        if( c == 'q' )
            running = 0;
      }
  }

  atexit(goodbye);
  return 0;
}

---

Any ideas?

Thanks

The problem is that the arrow keys and all F keys are extended and return 0 then the number for the key

I changed your code to work and it works fine now

Code:

---

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

void goodbye(void) { cout << "Goodbye!\n"; }

int main()
{
        int running = 1;
        int c;

        while( running )
        {
                if( !kbhit() )        // If the keyboard hasn't been hit..
                {
                        c = getch();        // Snatch the character from user
                        if(c==0)c = getch();        // Snatch the character from user

                        cout << (int)c << " " << (char)c << endl;

                        if( c == 'q' )
                                running = 0;
                }
        }

        atexit(goodbye);
        return 0;
}

---

Hope it helps ^_^