Changing the value of a pointed to integer in C

I want to declare a new integer in the heap,

int *intPtr = 开发者_C百科(int*) malloc(sizeof(int));

How do I change the value of the space in the heap, to which *intPtr points to? Thanks

Dereference intPtr:

*intPtr = 0;

First of all, you don't need to cast the result of malloc. malloc returns a void* and the void* is casted implicitly to any pointer (int*, char*, ...).

So :

int *intPtr = malloc(sizeof(int));

You can also write :

int *intPtr = malloc(sizeof *intPtr);

If you want to change the value pointed by intPtr, just use the dereference operator '*' like :

*intPtr = <new_value>

where is your new integer value.