void * malloc ( size_t size );
<cstdlib>
Allocate memory block
Allocates a block of size bytes of memory, returning a pointer to the beginning
of the block.
The content of the newly allocated block of memory is not initialized,
remaining with indeterminate values.
Parameters
size
Size of the memory block, in bytes.
Return Value
On success, a pointer to the memory block allocated by the function.
The type of this pointer is always void*, which can be cast to the desired type
of data pointer in order to be dereferenceable.
If the function failed to allocate the requested block of memory, a null
pointer is returned.
Example
/* malloc example: string generator*/
#include <stdio.h>
#include <stdlib.h>
int main ()
{
int i,n;
char * buffer;
printf ("How long do you want the string? ");
scanf ("%d", &i);
buffer = (char*) malloc (i+1);
if (buffer==NULL) exit (1);
for (n=0; n<i; n++)
buffer[n]=rand()%26+'a';
buffer[i]='\0';
printf ("Random string: %s\n",buffer);
free (buffer);
return 0;
}
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