One dimensional array being passed into the main() function - c

Question

The below code works fine except for a one dimensional array I am trying to pass to main() from the function order_coef. I believe I am doing something wrong in the line where I specify *ordered_array=*array;, but not really sure what it is. Some help would be very much appreciated. Thank you!
#include <stdio.h>
#define COEF 5
int save_coef (int i, int *array);
int order_coef (int i, int *array, int *ordered_array);
int save_x (int x);
int resolve_polinomyal (int *array, int x, int i);
int main()
{
int array[COEF], x = 1, i = 0, *ordered_array=0;
printf("Please, enter 5 coefficients:\n");
save_coef (i, array);
order_coef (i, array, ordered_array);
for (i = 0; i < COEF; ++i)
printf("\n%d\n", ordered_array[i]);
printf("Please, enter the value of x:\n");
save_x (x);
printf("%d", resolve_polinomyal (array, x, i));
return 0;
}
int save_coef (int i, int *array)
{
for (i = 0; i < COEF; ++i)
{
scanf("%d", &array[i]);
}
return 0;
}
int order_coef (int i, int *array, int *ordered_array)
{
int j, a;
for (i = 0; i < COEF; ++i)
{
for (j = i + 1; j < COEF; ++j)
{
if (array[i] > array[j])
{
a = array[i];
array[i] = array[j];
array[j] = a;
}
}
}
*ordered_array=*array;
return 0;
}
int save_x (int x)
{
scanf("%d", &x);
return 0;
}
int resolve_polinomyal (int *array, int x, int i)
{
for (i = 5-1; i > 0; --i)
{
array[i-1] = array[i] * x + array[i-1];
}
return array[0];
}

Answer 1

The first problem is you do not allocate for ordered_array.
When you declare
int array[COEF], x = 1, i = 0, *ordered_array=0;
it means you initialized ordered_array = NULL.
You can use the static or dynamic allocation:
int ordered_array[COEF];
//
int *ordered_array = malloc(COEF*sizeof(int));
The second problem is *ordered_array=*array not copy array to array. It assigns first value of array to first value of ordered_array.
If you want to copy the value from an array to another one, you should use memcpy or a loop to copy value by value.
For example:
// copy the values of array to ordered_array
memcpy(ordered_array, array, COEF * sizeof(int));

Answer 2

Based on #Hitokiri comment I am pasting here the final solution with my code updated:
#include <stdio.h>
#define COEF 5
int save_coef (int i, int *array);
int order_coef (int i, int *array, int *ordered_array);
int save_x (int x);
int resolve_polinomyal (int *array, int x, int i);
int main()
{
int array[COEF], x = 1, i = 0, ordered_array[COEF];
printf("Please, enter 5 coefficients:\n");
save_coef (i, array);
order_coef (i, array, ordered_array);
for (i = 0; i < COEF; ++i)
printf("\n%d", ordered_array[i]);
printf("\nPlease, enter the value of x:\n");
save_x (x);
printf("%d", resolve_polinomyal (array, x, i));
return 0;
}
int save_coef (int i, int *array)
{
for (i = 0; i < COEF; ++i)
{
scanf("%d", &array[i]);
}
return 0;
}
int order_coef (int i, int *array, int *ordered_array)
{
int j, a;
for (i = 0; i < COEF; ++i)
{
for (j = i + 1; j < COEF; ++j)
{
if (array[i] > array[j])
{
a = array[i];
array[i] = array[j];
array[j] = a;
}
}
}
for (i = 0; i < COEF; ++i)
ordered_array[i] = array[i];
return 0;
}
int save_x (int x)
{
scanf("%d", &x);
return 0;
}
int resolve_polinomyal (int *array, int x, int i)
{
for (i = 5-1; i > 0; --i)
{
array[i-1] = array[i] * x + array[i-1];
}
return array[0];
}