Resizing arrays using a function
main.c
#include <stdio.h>
#include <stdlib.h>
void add_to_array(int** arr, int* last_index, int* capacity, int elem) {
if (*last_index >= *capacity) {
int* realloc_result = realloc(*arr, sizeof(int) * *capacity * 2);
if (realloc_result == NULL) {
free(*arr);
printf("Realloc failed for arr");
exit(1);
}
*capacity *= 2;
*arr = realloc_result;
}
(*arr)[*last_index] = elem;
(*last_index)++;
}
int main(int argc, char *argv[]) {
int capacity = 4;
int* arr = malloc(sizeof(int) * capacity);
int last_index = 0;
add_to_array(&arr, &last_index, &capacity, 17);
add_to_array(&arr, &last_index, &capacity, 18);
add_to_array(&arr, &last_index, &capacity, 19);
add_to_array(&arr, &last_index, &capacity, 20);
add_to_array(&arr, &last_index, &capacity, 21);
printf("Capacity: %d\n", capacity);
printf("Last Index: %d\n", last_index);
printf("First element: %d\n", arr[0]);
printf("Last element: %d\n", arr[last_index - 1]);
free(arr);
return 0;
}
