Thread: password program

hi..i am trying to write a small password program..this is the code i have written...

Code:

#include<stdio.h>
#include<conio.h>

int main()
{
  clrscr();
  int count,pass[5];
  printf("Enter password..\n");
  count = 0;
  while(count < 5)
  {
     pass[count] = getch();
     count = count + 1;
     printf("*");
  }
  return 0;
}

The following is my problem..
1.when i press "RETURN" key or "BACKSPACE" key.. the character "*" is being displayed..
2.rather when "BACKSPACE" key is pressed i want the previously printed stars to be deleted.. and when "RETURN" key is pressed i want to compare the entered password with the actual password..

Can somebody please Guide me..

Thanking you,
V.Narendra

You could try to check the character before you print "*", for example:

Code:

if( isprint(pass[count]) ) {
   printf("*");
}

Obviously you need to do this before you update count. BTW if you plan on using pass as a string you need to terminate it with \0, which means you only have 4 characters for the actual password.

For number 2, I think you will need more control over the terminal (something like x,y coordinates and refresh) I don't know how much of that conio.h will provide for you.

thanks..for the reply..
but i dont know what does this isprint function does..
can you please explain..

isprint() tests if the character is printable, and if not returns false. Backspace and return would return false as they are not printable characters. You need to include ctype.h to use isprint() btw.

Code:

pass[count] = getch();
count = count+1;

/* turns into: */

pass[count++] = getch();

Also, if you're only programming this for yourself, go ahead, but realize that conio.h and its associated functions are outdated and system-specific.

All components of a for loop is there (init, condition, update), so that is another option.