Reference

2d-array-iteration.c

/**
 * Answer 7
 */
#include <stdio.h>
 
void main()
{
  int i, j;
  int num[3][4] = {
    {10,12,14,16},
    {20,22,24,26},
    {30,32,34,36}
  };
 
  for (i=0; i<3; i++)
  {
    for(j=0; j<4; j++)
    {
      printf("%d ", num[i][j]);
    }
    printf("\n");
  }
}

array-init-dynamic.c

/**
 * Answer 5
 */
void main()
{
  const int ELM_QTY = 12;

  int i, j, nums[ELM_QTY];

  for (i=0, j = 1; i < ELM_QTY; i++, j += 3)
  {
    nums[i] = j;
  }
}

array-init.c

/**
 * Answer 5
 */
#include <stdio.h>

void main()
{
  int nums[] = {1, 4, 7, 10, 13, 16, 19, 22, 25, 28, 31, 34};
}