c - Random array size at the beginning? -

i want make random sized array everytime program executes @ first compiler yells me

"error  2   error c2466: cannot allocate array of constant size 0" 

is there way can randomly choose size size = rand() % 100 @ beginning , intialize array int myarray[size]={0} ??? or should everytime initialize exact number @ beginning?

int main(void) {     int i;     int size=rand()%100;     int array2[size]={0};      for(i=0;i<size;i++)     //fill array random numbers         array2[i]=rand()%100;     ... } 

you can use malloc() or calloc() in c. example,

int size=(rand()%100)+1; // size can in range [1 100] int *array2 = (int*) malloc(sizeof(int)*size); 

but @ same time, array size can not other constant value.

the following 2 declarations valid.

int a[10]; 

and

#define max 10 int b[max]; 

but error if try declare using following methods.

int x=10; int a[x]; 

and

const int y=10; int b[y];