Suppose we have a function malloc() which tries to allocate memory dynamically (at run time) and returns a pointer to block of memory requested if successful or a NULL pointer otherwise.
~char *malloc() - a standard library function (see later).
Let us have a pointer: char *p;
~*p = (char *) malloc(100); ~ /* request 100 bytes of memory */
~*p = `y';
There is mistake above. What is it?
No * in
*p = (char *) malloc(100);
Malloc returns a pointer. Also p does not point to any address.
The correct code should be:
p = (char *) malloc(100);
If code rectified one problem is if no memory is available and p is NULL. Therefore we can't do:
*p = `y';.
A good C program would check for this: