Shulou(Shulou.com)06/03 Report--

In this issue, the editor will bring you about the content of process control. The article is rich in content and analyzes and narrates it from a professional point of view. I hope you can get something after reading this article.

Process control, also known as control flow, is a term in the field of computer computing, which includes the order in which individual instructions or statements, subroutines run or evaluate when the program is running, whether in declarative programming language or functional programming language, there are similar concepts.

Control flow (also known as process control) is a term in the field of computer computing, which refers to the order in which individual instructions (or statements, subroutines) are run or evaluated when the program is running. Similar concepts exist in both declarative programming languages and functional programming languages.

Basic concept

In declarative programming languages, flow control instructions refer to instructions that change the order in which the program runs, either by running instructions in different locations, or by selecting one of the two (or more) programs to run.

The flow control instructions provided by different programming languages vary, but they can be divided into the following four categories:

Continue to run a section of instructions (unconditional branch instructions) with bits in different locations.

If a particular condition is true, running an instruction, such as the C language switch instruction, is a conditional branch instruction.

Run an instruction several times until certain conditions are established, such as the C language for instruction, can still be regarded as a conditional branch instruction.

Run a section of instructions in different locations, but continue to run the instructions you were going to run after completion, including subroutines, coroutine, and continuation.

Stop the program without running any instructions (unconditional termination).

Lower-level mechanisms such as interrupts and signals in Unix systems can also have a subroutine-like effect, but such mechanisms are usually used to respond to external events or inputs. The self-modification of the program will also affect the control flow because of its impact on the code, but there are probably no obvious flow control instructions.

In machine language or assembly language, flow control is achieved by modifying program counter values. Some CPUs support only conditional branching (branch) or unconditional branching (sometimes called jump).

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