Programming itself is prettycomplicated. To begin at least with the fact that all actions must be spelled out step by step. But along with this need, there are a number of possibilities, which greatly facilitate the achievement of the task that programming should perform (Pascal, C, and Assembler - no matter what language is used). One such tool is the creation of loops.
The importance of cycles in programming
What is a cycle?Why is it needed and what advantages does a programmer get when using it? The cycle is an important structural component of programming, which allows you to automate the execution of a certain series of actions, provided that the specified parameters are respected. So, the simplest example of how a cycle works is giving a certain number to a power. There is no need to prescribe rows until it is enough, because the technique can do everything automatically with it. In practical implementation, the cycles also save a lot of time and labor, since when using a cycle, there is no need to prescribe the program code every time and for all actions. Simply enter the variables to be replaced and start the implementation. But how is the cycle diagram constructed? Or even a few? There are a lot of variants of the cycle implementation - information on the whole book about programming, "Pascal" we will consider or "Assembler". Therefore, for purely informational purposes, we propose to analyze the theoretical scheme of the two most popular in use:
- Cycle with post-condition.
- Cycle with a precondition.
All others are largely theirvariations and particular cases, therefore, they must be considered in certain contexts and in achieving specific goals. In the meantime, turn to the most popular. How do cycles with preconditions and postconditions differ from each other? This is what a cycle with a precondition looks like:
while "condition" do "program code"
General theoretical basis of the cycle with postcondition
This is a form of writing software code whenthe loop operator with the postcondition of execution is after the body. At first glance it may seem strange: really, why put the circumstance of execution after the program code? But there is nothing strange here: a feature of this form is that the code will be executed regardless of whether the fulfillment conditions are met or not. But only 1 time. Then they will check whether everything is as it should be or not. And in the absence of proper conditions, the body of the loop will be ignored. This is a very important and useful feature that a cycle with a postcondition has. On the example of what was it told and where can you see the practical implementation of the painted here? Here is an example of a loop with a postcondition:
repeat
"Program Code"
until "Condition"
General theoretical basis of the cycle with a precondition
But the most popular option is exactlythis. Its peculiarity lies in the fact that the condition must be met for execution, without which the code will never be executed. Typically, the software code is very large, and the activation of its entire negative impact on computer performance. Therefore, a rather cunning plan is used: most parts of the code fit into loops or, in general, separate classes, to which the reference goes exactly at the right moments. The rest of the time this code is, but not used by the computer. This scheme allows you to save processor power to run the program itself or other programs.
Practical implementation in various programming languages
A few words about the practical effectiveness of cycles.It should be noted first of all time savings, both as a user and programmer. The second has already been said, why this is why we should say a few words about the client. The fact is that the breakdown into separate parts allows the software to load and work faster, and, accordingly, the user will be only too happy to use such software. Moreover, this approach, when the code is stored in a loop or a separate class (which are often called from the body), and allows you to ensure work efficiency. In addition, you should record the speed of recording in separate memory cells. So, if everything had to be done manually, then it would be necessary to bypass each one and make the corresponding entry in it. And the cycle allows, at times or even dozens, to reduce the need to do everything yourself. And it removes the human factor, which can lead to the need for hours to look for the problem code.
Conclusion
So, summing up all written, you canto say that a cycle with a postcondition or a precondition allows saving in the most convenient way without losing quality. And when writing complex programs, he is one of the programmer’s best friends, helping him make the code easier to execute and to read. Therefore, when writing your code, do not hesitate to use a cycle with a postcondition or a precondition - they were created specifically to facilitate the process of creating software, and it will work against yourself — not to take advantage of this opportunity.
