Problem with do while loop

[tru.cutru]

I am pretty sure my code is right i copied it right out of the book. But for some reason I get this error message

First-chance exception at 0x667f6af2 (msvcr90d.dll) in doingWallE.exe: 0xC0000005: Access violation writing location 0x00000000.
Unhandled exception at 0x667f6af2 (msvcr90d.dll) in doingWallE.exe: 0xC0000005: Access violation writing location 0x00000000.

#include "stdafx.h"
#include "stdio.h"

int main()
{
int value;
	do
	{
	printf("\n\nenter a number: ");
	scanf(" %d, &value");
	}
	while(value<=20);
	return (0);
}

I know how while loops work, but I went back to my book to make sure I was doing it right because my project would give me the same error message. Then I copied this test code right at the book and all of the sudden I am getting the same error message. This happens only when I use do while loops. Can anyone tell me why is this happening?

Also the program runs but it crashes as soon as I enter any input (a number below or above 20)

[C_ntua]

It is

scanf("%d", &value);

You have the " wrong.

[tru.cutru]

OH JESUS. I probably had that wrong on my other code too. Thanks