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the first select, followed by an expression which is often referred to as the control expression or control variable of the switch statement; subsequent lines defining the actual cases (the values), with corresponding sequences of statements for execution when a match occurs
The structured program theorem, also called the Böhm–Jacopini theorem, [1] [2] is a result in programming language theory.It states that a class of control-flow graphs (historically called flowcharts in this context) can compute any computable function if it combines subprograms in only three specific ways (control structures).
In computer science, control flow (or flow of control) is the order in which individual statements, instructions or function calls of an imperative program are executed or evaluated. The emphasis on explicit control flow distinguishes an imperative programming language from a declarative programming language.
Structured programming is a programming paradigm aimed at improving the clarity, quality, and development time of a computer program by making specific disciplined use of the structured control flow constructs of selection (if/then/else) and repetition (while and for), block structures, and subroutines.
The Michael selection theorem [2] says that the following conditions are sufficient for the existence of a continuous selection: X is a paracompact space; Y is a Banach space; F is lower hemicontinuous; for all x in X, the set F(x) is nonempty, convex and closed. The approximate selection theorem [3] states the following:
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A control structure diagram (CSD) automatically documents the program flow within the source code and adds indentation with graphical symbols. Thereby the source code becomes visibly structured without sacrificing space.
Instead, it can switch from one continuous structure to another based on the current position in the state space. Hence, sliding mode control is a variable structure control method. The multiple control structures are designed so that trajectories always move toward an adjacent region with a different control structure, and so the ultimate ...