Thread: arrays

I have no idea how these output to these numbers and I don't know what they're for, anyone help?

Code:

#include <stdio.h>


int main() {
   /* my first program in C */
   printf("Hello, World! \n\n");
   printf("hello world 2 \n\n");
   
   
   int int1 = 1;
   int int2 = 2;
   int int3 = (int1 + int2);
   
   printf("1 + 2 = %d \n\n",int3);
   
   double array1 [10] = {2.0, 4.0, 6.0};
   printf ("%d \n\n",array1);
   
   double array2 [25] = {5.0, 2.0, 9.0};
   printf ("%d \n\n",array2);     
   
   return 0;
}