Assessment of practical C-language skills Task3

#include <stdio.h>
#include <stdlib.h>

int* arr;
int capacity = 1, size = 0;

void swap(int *xp, int *yp) {
    int temp = *xp;
    *xp = *yp;
    *yp = temp;
}

void push (int newElement) {
    if (capacity == size) {
        capacity *= 2;
        int* newArr = (int*)malloc(capacity * sizeof(int));
        for (int i = 0 ; i < size ; i ++)
            newArr [i] = arr [i];
        newArr [size ++] = newElement;
        free(arr);
        arr = newArr;
    } else {
        arr [size ++] = newElement;
    }
}

int main(void) {
    arr = (int*)malloc(capacity * sizeof(int));
    int number;
    scanf("%d", &number);
    push(number);
    while(1) {
        scanf("%*c");
        scanf("%d", &number);
        if (number < 0) break;
        push(number);
    }
    int i, j;
    for (i = 0 ; i < size - 1 ; i ++)
        for (j = 0 ; j < size - i - 1; j ++)
            if (arr [j] > arr [j + 1])
                swap(&arr [j], &arr [j + 1]);
    for (i = 0 ; i < size ; i ++) {
        printf("%d", arr[i]);
        if (i == size - 1) printf ("\n");
        else printf (",");
    }
    free(arr);
    return 0;
}