advanced patterns with Dynamic Array Resizing in C Using `realloc`
I tried several approaches but none seem to work. I'm working with an scenario with dynamically resizing an array using `realloc`. I initially allocate an array of integers and later attempt to resize it, but I'm working with unexpected results. Here's a snippet of my code: ```c #include <stdio.h> #include <stdlib.h> int main() { int *arr = malloc(5 * sizeof(int)); if (!arr) { perror("Initial malloc failed"); return EXIT_FAILURE; } for (int i = 0; i < 5; i++) { arr[i] = i + 1; } // Print initial array printf("Initial array: "); for (int i = 0; i < 5; i++) { printf("%d ", arr[i]); } printf("\n"); // Attempt to resize the array int new_size = 10; int *temp = realloc(arr, new_size * sizeof(int)); if (!temp) { perror("Realloc failed"); free(arr); return EXIT_FAILURE; } arr = temp; // Initialize the new elements for (int i = 5; i < new_size; i++) { arr[i] = i + 1; } // Print modified array printf("Resized array: "); for (int i = 0; i < new_size; i++) { printf("%d ", arr[i]); } printf("\n"); free(arr); return EXIT_SUCCESS; } ``` When I run the program, I see the output for the initial array as expected, but the resized array includes unexpected values for the new elements. Specifically, instead of seeing values from 6 to 10 in the array, I see that some uninitialized memory values are appearing. I've double-checked that I'm initializing the new elements after the `realloc`. Are there any specific considerations I might be missing when using `realloc`? Also, could this behavior be related to the specific compiler settings or version? I'm using GCC version 11.2 on Ubuntu 20.04. If anyone has insights on how to ensure the newly allocated memory is correctly initialized or if there are any best practices for handling dynamic arrays in C, I would really appreciate it! Am I missing something obvious? What's the correct way to implement this? My team is using C for this REST API. I'm open to any suggestions.