c malloc and free code example

Example 1: allocate memory c

// Use malloc to allocate memory
ptr = (castType*) malloc(size);
int *exampl = (int*) malloc(sizeof(int));
// Use calloc to allocate and inizialize n contiguous blocks of memory
ptr = (castType*) calloc(n, size);
char *exampl = (char*) calloc(20, sizeof(char));

Example 2: how to free memory in c

int *example = NULL; //create pointer
example = malloc(sizeof(int)); //allocate memory
free(example); //deallocate memory