Why can't I create an array with size determined by a global variable?

Question

Why does the array a not get initialized by global variable size?

#include

int size = 5;

int main()
{
    int a[si         


        

Answer 1

You don't need to tell the compiler what size the array is if you're giving an initializer. The compiler will figure out the size based on how many elements you're initializing it with.

int a[] = {1,2,3,4,5};

Then you can even let the compiler tell you the size by getting the total size of the array in bytes sizeof(a) and dividing it by the size of one element sizeof(a[0]):

int size = sizeof(a) / sizeof(a[0]);