2、 Relationship between software operation and memory

Memory is used under the unified management of the operating system

1. The software needs Request storage space from the operating system , When there is enough free memory , The operating system will allocate a section of memory space and store a copy of the software in the external memory in the memory space , And start the operation of the software .
2. While the software is running , The memory space occupied by the software No longer allocate To other software .
3. When the software is running , operating system This memory space will be reclaimed （ Be careful ： The operating system does not empty the data left by the memory space ）, For redistribution to other software .

in summary ： In the space allocated by a software, there is likely to be residual data used by other software before , These data are called Junk data . So usually we need to be a variable 、 Is an array , After allocating storage space , Initialize the memory space .