What are some examples of memory allocation in C?

What are some examples of memory allocation in C?

In C, memory allocation can be done using functions like malloc, calloc, and realloc. Would you like examples of each?

Yes, please provide examples for malloc and calloc.

Sure! For malloc, you can use it like this:

int *arr = (int *)malloc(5 * sizeof(int));

This allocates memory for an array of 5 integers. For calloc, it looks like this:

int *arr = (int *)calloc(5, sizeof(int));

This allocates memory for 5 integers and initializes them to zero.

What about realloc? How does that work?

Realloc is used to resize previously allocated memory. For example:

arr = (int *)realloc(arr, 10 * sizeof(int));

This resizes the array to hold 10 integers. If the new size is larger, it may allocate new memory and copy the old data.