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How many pointers can be used in a c program?
Answergenerally we use simple pointer, void pointer,null pointer, structure pointer. Answerzero or more (unlimited).
What do you mean by managed and unmanaged code in net?
"Unmanaged code" is a new name for an old concept. Unmanaged code stands for native machine code. Software is typically written in some high-level language such as Pascal, C or C++. These languages are translated into machine code (aka unmanaged code) by the compiler and its companion tools (assembler, linker, librarian, etc). The generated code runs natively on the host processor; that is, the processor directly executes the code generated by the compiler. This approach typically results in fastest code execution, but diagnosing and recovery from errors might be easier in managed code. Managed code is a new name, but the concept also is pretty old. Today, "managed code" typically stands for the system used by Microsoft .NET, but .NET is just one example of a managed code system. The .NET system takes source code in any of the supported languages (which include C, C++, C#, Pascal, and many others), and translates it into code designed for a virtual machine. The real processor cannot execute this code natively, but it can execute a program which then in turn executes the virtual machine's codes. The program that executes the virtual machine code is known as the virtual machine. While potentially slower than native code execution, the virtual machine can manage code (!) better than real machines. For example, the virtual machine can supervise memory allocation, automatically handle disposal of unused memory, and provide many other services that a native (unmanaged) application typically must explicitly provide. If the virtual machine does its job correctly, all applications using this virtual machine are likely to benefit. Virtual machines are also known under other names. In the Java system, the tool is called a JVM, a Java Virtual Machine. In the Microsoft .NET system, the intermediate language is called MSIL (Microsoft intermediate language), which are executed through a Just-in Time MSIL compiler (JIT-compiler). Early implementations of Pascal generated an intermediate code called P-code, executed at runtime through some P-code interpreter. Other forms of managed code exist.
What are the two major classifications for virtual machines?
Virtual machines are divided into two major classifications, based on their use and degree of correspondence to any real machine. They are either a system virtual machine or a process virtual machine.
Delete memory release operator in c plus plus?
You can't physically delete memory, you can only delete a pointer to allocated memory, which subsequently releases the memory back to the system. The operator is delete, passing the pointer as the operand. If the pointer points to an array, then you must also use the index operator [] in front of the pointer name.int main(){// pointer to an int type with value 100int* ptr_int = new int(100);// ... use pointer ...// release the integerdelete ptr_int;// pointer to an array 100 int types (with undefined values)int* ptr_int_array = new int[100];// ... use array ...// release the arraydelete [] ptr_int_array;return(0);}
Why do modern machines consist of multiple levels of virtual machines?
Modern machines do not consist of multiple levels of virtual machines; that is a function of the host operating system's virtual machine manager and its guest operating systems, all of which are implemented through software. The operating system's virtual machine manager exposes one or more virtual machines upon which you can host one or more guest operating systems and their applications. In order to execute compiled Java applications upon one of these guest operating systems you will also need to install the Java virtual machine for that specific operating system. Thus you end up with a Java program executing within a Java virtual machine executing within a virtual machine executing within a virtual machine manager executing upon the physical hardware. The physical hardware itself may be optimised to handle virtual machine managers more efficiently, but the virtual machine manager is a software program; it is not part of the physical machine architecture
How did the national park system start?
they was originally managed at first
When working with computers what are handles?
A handle is a particular kind of smart pointer. Handles are used when an application references blocks of memory or objects managed by another system, such as a database or an operating system Copied from a website I can no longer locate. A handle is a particular kind of smart pointer. Handles are used when an application references blocks of memory or objects managed by another system, such as a database or an operating system Copied from a website I can no longer locate.
Under Windows 2000XP physical memory and virtual memory are managed by what application?
Physical memory, as with all computer resources, is managed by the system. Applications access virtual memory exclusively, no exceptions, ever. Physical memory (RAM), the pagefile, and many other files on the hardisk make up the virtual memory system. This system has been extensively researched and tested and it usually performs very well. Virtual memory is VERY complex, and the designers understand it better than you do.
What is the meaning of managed care?
How does the National Health Insurance system, such as the one adopted by the country of Canada differ from the National Health system, such as the one structured in Great Britain.
What functions are provided by the Virtual file system in the Fedora Core 4 system?
A virtual file system allows for disk files and other items to be managed regardless of the disk type or format, i.e. read, write, etc. Fedora Core 4 is very old, and if you want a suggestion, please consider replacing it if you are having problems.
List different components of virtual Reality system?
list different components of Virtual Reality system
What is the virtual machine system?
Java virtual machine
When was Parallel Virtual File System created?
Parallel Virtual File System was created in 2003.
What is handles in computer terms?
A handle is a particular kind of smart pointer. Handles are used when an application references blocks of memory or objects managed by another system, such as a database or an operating system copied from a web site I can no longer locate.
What are virtual devices in operating system?
virtual devices in os
What is virtual memory and how the system controls the situation in the absence of it?
What is virtual memory and how the system controls the situation in the absence of it?
What happens if you have no virtual memory?
If you are using a modern version of Windows (Windows 95 or latter) you will be using virtual memory. Virtual memory is NOT the pagefile and it is not an extension to physical RAM but a system that is completely integrated into the system. Applications access virtual memory exclusively, no exceptions, ever. You can not disable virtual memory. You can disable the pagefile (not recommended) but this will not disable virtual memory. The system provides a virtual environment to processes that is completely independent of how much RAM is in the system. This is an advanced system that provides many important advantages to applications and users.
