Thread: null terminated

I've read that a string always has to be NULL terminated, so I decided to fool around a little with it.

Code:

#include <stdio.h>
#include <string.h>

int main()
{
    char naam[20];
    int x;
    printf("Voer naam in: ");
    scanf("%20s", &naam); 
    
    if (strlen(naam) > 19)
    {
        printf("String te lang (max 20).. hij zal ingekort worden.\n\n");
    }
    for (x = 0; x <= 20; x++)
    { 
        printf("karakter %d: %c\n", x, naam[x]);
    }
    
    naam[20] = 'd';
    for (x = 0; x <= 20; x++)
    { 
        printf("karakter %d: %c\n", x, naam[x]);
    }    
    printf("naam: %s", naam);
}

as you can see naam[20] is filled with d at the end, why is that accepted, now theres now the string isn't terminated, isnt this potentialy dangerous?

I dunno maybe Im just talking bull$$$$ & newbie like, but im curious.
thanx

all right

There is a problem with your

Code:

 for (x = 0; x <= 20; x++)
{
printf("karakter %d: %c\n", x, naam[x]);
}

if the input is less than 19 characters long.

It should be x< strlen(naam) (not even x<20 )

Code:

naam[20] = 'd';
	for (x = 0; x <= 20; x++)
		  printf("karakter %d: %c\n", x, naam[x]);
	 printf("naam: %s", naam);

doesn't work at all.

You also forgot to return 0; in function main().

it works and outputs like this:

Code:

C:\Program Files\Dev-Cpp\Crypt>stringtest
Voer naam in: test
karakter 0: t
karakter 1: e
karakter 2: s
karakter 3: t
karakter 4:
karakter 5: ▲
karakter 6: Φ
karakter 7: w
karakter 8: ♀
karakter 9:
karakter 10:
karakter 11:
karakter 12: ☻
karakter 13:
karakter 14:
karakter 15:
karakter 16: `
karakter 17: _
karakter 18: "
karakter 19:
karakter 20:
karakter 0: t
karakter 1: e
karakter 2: s
karakter 3: t
karakter 4:
karakter 5: ▲
karakter 6: Φ
karakter 7: w
karakter 8: ♀
karakter 9:
karakter 10:
karakter 11:
karakter 12: ☻
karakter 13:
karakter 14:
karakter 15:
karakter 16: `
karakter 17: _
karakter 18: "
karakter 19:
karakter 20: d
naam: test

that wasnt the point.. i was wondering about the null termination.

and you were right i forgot return 0;