how can i store data in to a array

You don't need to specify the array index when writing to it:

#include <stdio.h>
#include <conio.h>
int main (void)
{
 char vnaam[50];
printf("Wat is u voornam ?");
scanf("%s",vnaam);
getchar();
printf("well look %s",vnaam);
getchar();    
}

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thanks my code looks like this

i have another question what if i dont know how long the array will be, now its 50 but can just leave it blank ?

#include <stdio.h>
#include <conio.h>
int main (void)
{
 char vnaam[];
printf("Wat is u voornam ?");
scanf("%s",vnaam);
getchar();
printf("well look %s",vnaam);
getchar();    
}

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>> char vnaam[];
Sorry, this is not valid. If you are filling up an array with scanf, you should make it much larger than any possible entry. After the entry, it will be null terminated.

I'm not sure about scanf function but I remember that cin function in C++ takes 512 characters, not more.