A.t.m. *********

[imbecile in C]

i have a curious question....

Something occurred to me while on an ATM,..

I wish to write a program asking a password...but i was bogged a little with this problem...


1. A user types "stuff" on the keyboard, and all that displays is a sequence of asterisks "*****"

2. Then when he presses "Enter", then (I want) the whole stuff that he just typed displays on the screen..

"stuff" could be numbers, characters or special characters...

the password comparing is easy,.. but could you advise me with the asterisks,..

any codes/ideas to share ?

Oi !!

[XSquared]

Lets see some code.

[imbecile in C]

ok, here's my code.. Its really stupid..

coz everytime i type some "stuff"... i could see the "stuff" on the screen.. and when i hit enter, that's when i see the asterisks="****"

it should work the reverse,..
i type some "stuff" and i wanna see the asterisks, and when i hit enter,. thats when i should see what I just typed...

stuff could be = could be characters, integers,.. whatever

#include <stdio.h>
int main(void)
{
 char str[80];
 int num[80];
 clrscr();
 printf("type anything dude: ");
 while (getchar() != '\n')
 printf("*");



getch();
}

that's all i end up with,... please help !

[XSquared]

while (getch() != '\n') {
  printf("\b*");
  fflush( stdout );
}

[Speedy5]

I just made this. Crude, simple and it works. If it don't work there, take out the underscore in the _getch() call.

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

void gets_mask(char *str, char mask)
{
	while (*str = _getch())
	{
		if (*str == 13)
		{
			*str = NULL;
			return;
		}
		putch(mask);
		str++;
	}
}

int main()
{
	char pw[16];
	
	gets_mask(pw, '*');
	printf("\npw: %s\n", pw);

	printf("\n\n");
	system("pause");
	return 0;
}

[imbecile in C]

sorry, but i couldn't follow....

im trying and analyzing using:

if (isalnum(ch))
    {
      printf('*');
     }

i'll understand this thing soon....

but at the moment im listing my theories...


p.s: thanks for the reminding me to check previous threads !!

[imbecile in C]

Oi Speedy 5 !!!


yeah ! its crude, simple.. but it works...

your use of functions (or whatever you call it), mezmerizes me to the point that i have to browse my book over and over again..

you got this fabulous:


system("pause");


Whew !!

thanks dude !!

[Dave_Sinkula]

Have you tried the example in the FAQ?

[WaltP]

Unfortunately, the operation you are trying to accomplish will require your compiler to handle single character input, which is not standard.

The compiler's I use (Borland and M$) have this capability using getch() as mentioned, but other compilers do not have this function. The ncurses.h
may have something usable on Linux.

Speedy5's post is close to how I'd do it too, except for not testing for too many chars typed.

Oh, and instead of using the overhead of system("pause");, why not jus use getch();?

[Speedy5]

Thats why I said it was crude.

And its just habit using system-pause. I've always done it and the overhead is so dumb. Its at the end of the program! But yea, use this instead. Its more portable, faster, and uses less memory:

printf("\n\nPress any key to continue . . . ");
_getch();
return 0;

[WaltP]

Originally posted by Speedy5
Thats why I said it was crude.

And its just habit using system-pause. I've always done it and the overhead is so dumb. Its at the end of the program! But yea, use this instead. Its more portable, faster, and uses less memory:

printf("\n\nPress any key to continue . . . ");
_getch();
return 0;

Au contraire, it is less portable. See my previous post. Use:

printf("\n\nPress ENTER to continue . . . ");
getchar();
return 0;

That is portable.