Kenhuang Academy
  • English

      • C Memory Management

      Dynamic memory allocation allows programs to request memory at runtime.

      1. Memory Allocation Functions

      #include <stdlib.h>

int *ptr = (int*)malloc(sizeof(int) * 10);  // allocate
if (ptr == NULL) {
    // handle allocation failure
}

free(ptr);  // deallocate
ptr = NULL;  // avoid dangling pointer

      2. calloc

      int *ptr = (int*)calloc(10, sizeof(int));  // allocate and initialize to zero

      3. realloc

      ptr = (int*)realloc(ptr, sizeof(int) * 20);  // resize

      4. Memory Leaks

      Always free allocated memory to avoid memory leaks:

      int *data = malloc(100);
// use data
free(data);  // don't forget!