返回远堆中未使用存储区大小

[c]代码库

#include <stdio.h>
#include <alloc.h>

int main ( void )
{
	printf ( "The difference between the\
    highest allocated block in the\
           far\n" );
	printf ( "heap and the top of the far heap\
           is: %lu bytes\n", farcoreleft() );

	return 0;
}