Help with array please

I'm doing a complex homework assignment, so I decided to try and break it up into steps so I can figure it out easier but even the small steps are turning out to be very difficult for me.

My problem is I can't figure out how to populate this array with a unknown size. Additonally I am a very noob at this programming and am having trouble correcting these errors. Could someone please help me? Thanks.

Code:

---

//Populating Array


//Printing the Array


#include <stdio.h>
void printArray(int);


int main(void)


{
    char more_to_process;
    int num[], i=0;
printf("Are there any more numbers to be converted?\n");
    printf("Please type Y to continue and N if you want to stop \n");
    scanf("%c", &more_to_process);
    while ((more_to_process != 'Y') && (more_to_process != 'N'))
{
    printf("Please type Y to Continue and N if you want to stop \n");
    scanf("%c", &more_to_process);
    }
   
    if (more_to_process = 'Y'){
        printf("\nENTER THE NUMBER\n");
        scanf("%d",num[i]);   
       
                else
        for(x = 0;x <= i; x++){
            printArray(num[x])
        }
    }
}   
   
        printArray(int num)
    {
    printf("%d\n",num);
    }

---

​ERRORS

Quote:

---

Array1.c: In function 'main':
Array1.c:12: error: array size missing in 'num'
Array1.c:26: error: expected '}' before 'else'
Array1.c:27: error: 'x' undeclared (first use in this function)
Array1.c:27: error: (Each undeclared identifier is reported only once
Array1.c:27: error: for each function it appears in.)
Array1.c:29: error: expected ';' before '}' token
Array1.c: At top level:
Array1.c:31: error: expected identifier or '(' before '}' token
Array1.c:33: warning: conflicting types for 'printArray'
Array1.c:6: warning: previous declaration of 'printArray' was here

---

If you need to populate an array who has an unknown size, you may need to use dynamic memory allocation (dynamic arrays).

To declare the array as dynamic : int* num (this may solve some of your compilation problems).

To see how to allocate dynamic memory, check this out:
Dystopian Code: Dynamic Multidimensional Arrays in C

After you allocated the memory you can use like a "normal" (static memory) array.

Code:

---

{        char more_to_process;
        int* num[], i=0;
printf("Are there any more numbers to be converted?\n");
        printf("Please type Y to continue and N if you want to stop \n");
        scanf("%c", &more_to_process);
        while ((more_to_process != 'Y') && (more_to_process != 'N'))
{
        printf("Please type Y to Continue and N if you want to stop \n");
        scanf("%c", &more_to_process);
        }
       
        if (more_to_process = 'Y'){
                printf("\nENTER THE NUMBER\n");
                scanf("%d",num[i]);       
               
                                else
                for(x = 0;x <= i; x++){
                        printArray(num[x])
                }
        }
}       
       
                printArray(int num)
        {
        printf("%d\n",num);
        }

---

Thats what I did same exact errors. Even more confused. This is my first time using arrays in C. I am not very good at this.

If you're just learning arrays, then I'd suggest you start with statically defined arrays.

Code:

---

int num[100] ;

---

or even

Code:

---

#define ARR_SIZE 100

int num[ARR_SIZE] ;
...
//and for loop to populate array, read array, print array, etc.
for( i = 0 ; i < ARR_SIZE ; ++i )
{...}

---

Above is understandable ty though Tclausex ; like I said my program has to use input a array with a unknown length.. Trying to put what I just said in proper english is difficult; and that is my main source of current troubles.

Code:

---

if (more_to_process = 'Y'){

---

That is an assignment, not a comparison. = for assignment, == for comparison.

Code:

---

int *array = malloc(numItems * sizeof(*array));
int i = 0;
for(; i < numItems; ++i) {
    array[i] = i + 1;
}

for (i = 0; i < numItems; ++i) {
    printf("Index: %d Value: %d\n", i, array[i]);
}
free(array);

---

Certainly not the way I would introduce students to arrays, but what do I know.

dheaven's link and Dynamic Memory Allocation, Part 1 should help you.

In any case, you'll at least want to determine from the user how many integers are to be entered. If reading from a file, you could count the number of integers, then do the memory allocation.