dynamic-integer-array.c

#include "stdio.h"
#include "stdlib.h"

typedef struct dyn_int_array
{
  int *base;
  unsigned long size;
} dyn_int_array;

dyn_int_array new_dyn_int_array()
{
  dyn_int_array result;

  result.size = 0;
  result.base = (int *)calloc(result.size, result.size * sizeof(int));

  return result;
}

void dyn_int_array_push_back(dyn_int_array *array, int value)
{

  array->size += 1;
  array->base = (int *)realloc(array->base, array->size * sizeof(int));
  array->base[array->size -1] = value;

}

void dyn_int_array_pop_back(dyn_int_array *array)
{
  if (array->size <= 0)
    return;

  array->size -= 1;
  array->base = (int *)realloc(array->base, array->size * sizeof(int));
}

void dyn_int_array_free(dyn_int_array *array)
{
  free(array->base);
}

int main()
{
  dyn_int_array dynamic_array;

  //Create the dynamic integer array.
  dynamic_array = new_dyn_int_array();

  //Push ten numbers to the back of the dynamic array.
  for ( int i=1; i<=10; i++ )
  {
    dyn_int_array_push_back(&dynamic_array, i);
  }

  //Walk over the dynamic array.
  for ( int i=0; i<dynamic_array.size; i++ )
  {
    printf("Value: %i, Address: %ld\n", dynamic_array.base[i], (long)&dynamic_array.base[i]);
  }

  //Remove one entry from the back of the dynamic array.
  printf("Popping from back...\n");
  dyn_int_array_pop_back(&dynamic_array);

  //Walk over the dynamic array again.
  for ( int i=0; i<dynamic_array.size; i++ )
  {
    printf("Value: %i, Address: %ld\n", dynamic_array.base[i], (long)&dynamic_array.base[i]);
  }

  printf("Freeing memory...\n");
  dyn_int_array_free(&dynamic_array);

  return 0;
}