How to resize arrays in C (Part 1)
main.c
#include <stdio.h>
#include <stdlib.h>
int main(int argc, char *argv[]) {
int* arr = malloc(sizeof(int) * 4);
int last_index = 0;
arr[last_index] = 17;
last_index++; // 1
arr[last_index] = 18;
last_index++; // 2
arr[last_index] = 19;
last_index++; // 3
arr[last_index] = 20;
last_index++; // 4
int* realloc_result = realloc(arr, sizeof(int) * 8);
if (realloc_result == NULL) {
free(arr);
printf("Realloc failed for arr");
return 1;
}
arr = realloc_result;
arr[last_index] = 21;
last_index++;
printf("First element: %d\n", arr[0]);
printf("Last element: %d\n", arr[last_index - 1]);
free(arr);
return 0;
}
