#include <stdio.h>
#include <math.h>
int main(void){
    double vec[65536];
    int i = -1;
    while(scanf("%lf",&vec[++i]) != EOF)
        ;
    for(-- i; i >= 0; i--)
        printf("%.4lf\n",sqrt(vec[i]));
    return 0 ;
}

the program run on my computer successfully,who can tell me what the access violation mean about above program. thanks

...
int main(void){
    double vec[65536];
    ...

replace it to

...
double vec[200000];
int main(void){
   ...