Add n Integers to an non fixed Array - c

Question

I've been looking for a solution quite a while now, but did not manage to find anything.
I need a program which takes the users input (a random amount of integers) until EOF, sums them up and gives me back the average.
I tried it using an array but I am not sure whats my mistake here.
I managed to get it working with a fixed size array. But I need a flexible one.. Is this even possible?
Here is what I got so far:
#include <stdio.h>
int main()
{
int count = 3;
int numbers[count];
long sum;
float average;
int i;
for (i = 0; i < count; i++) {
while (scanf("%d", &numbers[i]) != EOF) {
sum += numbers[i];
}
}
average = (float)sum/count;
printf("Average of your numbers is: %.2f\n",average);
return 0;
}

Answer 1

If you're just trying to find the average then you don't need to actually store these numbers.
int count = 0;
int sum = 0;
int num = 0;
double avg = 0.0;
for(; scanf("%d", &num) != EOF; sum += num, count++)
;
avg = sum / count;

Answer 2

After checking with OP, he does not mind if the inputs are not stored in array. In that case, you may want to consider this:
int num=0;
int sum=0
int count=0;
do
{
printf("Enter number:");
scanf("%d", num);
sum += num;
count++;
printf("Proceed(y/n)?");
scanf("%c", proceed);
}while(proceed == 'y');
This code may be a little troublesome that you need to enter 'y' to continue inputing, but this may solve your current problem of inputting n inputs.

Answer 3

You will need to realloc the size of the array if you have filled the existing array. This should work:
#include <stdio.h>
#include <stdlib.h>
int main() {
int input;
int size = 0;
int* arr = NULL;
int* temp = NULL;
long sum = 0;
float average = 0;
do {
scanf("%d", &input);
size++;
temp = (int*) realloc(arr, sizeof(int)*size);
if(temp != NULL) {
arr = temp;
arr[size-1] = input;
}
sum += input;
} while(input != 0);
average = sum / size;
printf("sum: %lu\n", sum);
printf("average: %f\n", average);
return 0;
}

Answer 4

It does not have to be an array if all you're doing is adding up numbers
int number = 0;
int count = 0;
while(scanf("%d", &number)!=EOF)
{
sum += number;
count++;
}
Also this will never work because count is supposed to be a constant
int count = 3;
int numbers[count];