System Software

System Software

• Describe the purpose of operating systems.
• Describe the characteristics of different types of operating systems and their uses: batch, real-time, single-user, multi-user, multi-tasking and network systems
• Identify a range of applications requiring batch processing and a range of applications in which a real time response is required.
• Describe different types of user interface: forms, menus, GUI, natural language and command line, suggesting the characteristics of user interfaces which make them appropriate for use by different types of user.
• Describe the purpose of a range of utility software e.g. disk formatting, file handling, hardware drivers, file compression and virus checkers.

Hardware software

everything that happens in a computer goes from
Input-Processor-Output
                ||
                ||
           Storage
storage

The CPU infact dose not connect directly with the hard drive but instead with the RAM stick. As trying to connect the CPU to hard drive is like talking to someone from a jet plane to a bike.

Software:
Software= sets of instructions which will tell the system how to do something. These instructions are collected together in a workable group which is called a program.

Operating system

• User interface software

Provides a GUI
Provides a Platform for apps top so on it
Middle, am between apps and hardware e.g Word dose not know anything about printers but OS dose

• Translate software (TS)

An OS provides its own TS
Translate high level language into machine code

• Untilities

Allows you to change the sysetm to a certain extent

• Common Applications

i.e Iphoto

Three types of loops used in Visual Basic 2008

There are three types of loops used in Visual Basic:

For...Next
Do While
Loop...Until

Each performs basically the same function,running a piece of code alot times.

The For...Next loop is used to run a piece of code a set number of times (it is the only loop with a set number of iterations). As its name suggest, it is used when a function needs to be carried out FOR each of several items, for example when doing formatting for each name in a list. The For...Next loop changes a variable every time it runs, so that the function can be specialised for each item.

The Do While loop runs a piece of code if a condition is true. If the loop starts running, here must be a section inside the loop to either alter the condition or break out of the loop, otherwise it will run indefinitely. If the condition is initially false, the Do While loop does not run at all. It could be used instead of a Loop...Until loop nested in an If statement.

The Loop...Until loop is exactly the same as the Do While loop except that it will always run the code inside before checking whether the condition is true; that is, the code inside will always run at least once even if the condition is false.

Loops can be nested inside each other or used in conjunction with control flow statements.

i love computer science

it is rather cool