对操作系统的动态内存分配（其中包括首次适应算法和最佳适应算法）。可以对内存进行分配，可以查看内存分配情况，可以释放内存。释放内存时，要考虑前后是否有空闲块，有的话得合并，并要改变内存的大小以及视情况改变分配内存的起始地址。-Dynamic memory allocation of the operating system (including first-fit algorithm and the best fit algorithm). Memory can be allocated, you can view the memory allocation, memory can be released. Free memory, it is necessary to consider whether there is idle before and after the block, so may be combined, and to change the memory size and allocation of memory as to change the starting address.