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Dependence on performance nobody conditions. Thus, we will receive structure of a conditional branch and possibility of the organisation of a finite cycle.Generally speaking, so we can solve almost any task demanding implementation of cyclic algorithm. Certainly, by means of one only an axe it is possible to construct the house. We will put before themselves questions: "And whether there will be this
The house is beautiful? What is the time and forces it is possible to save, using every possible special tools? ". The creator of language of Pascal Niklaus Virt also was set by these questions and has solved them in favour of the extension of language three special possibilities of the organisation of cycles. For what? - For convenience, short, simplicity of reading of the program and, I will not be afraid this word, beauty.
So, there are three sorts of the cycle, having own operators in language ??????? for their record. These sorts have own conditional names:
"While", "To", "With parametre". From each other they differ a little and
Are used everyone for the class of tasks.
Cycle "WHILE"
The group of operators named as "iteration body", judging by this circuit, will be
To be fulfilled while the cycle condition is true. Loop termination will occur, when
The condition will cease to be fulfilled.
If the condition is is false initial, the iteration body will not be fulfilled never. If the condition is initially true and in an iteration body there are no the operations influencing the validity of this condition the iteration body will be fulfilled the infinite
Quantity of times. Such situation is named as "loophole". To interrupt the gone in cycles program can or the operator (having pressed Ctrl+C), or emergency
Break of the program, in case of overflow of a variable, divide by zero
Etc., therefore to use cycle structure follows with care, well understanding that multiple performance should be ended sometime.
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