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Sort and to write.The constants representing string values, consist in apostrophes.
If the same value is used in the program some times it would be more convenient to designate its any name and to use this name everywhere where it is required to write an appropriate constant. Except abbreviation
The size of the source text of the program, it will allow to avoid soft errors, and also will simplify a program debugging. The description of concrete constants starts syntactic word Const. Sort records Further follow:
<Identifier> = <value>;
Example: Const Pi=3.14;
Name1 ='??????? ';
Name2 ='?????? '; R21=6.33187E+03; W_W_W=934122;
Concept of a variable. Types.
Data as you know, are stored in a computer memory, but for instructions
It is very inconvenient to write all time to the concrete information the physical
Addresses of cells. This problem in high-level languages, in particular in Pascal, is solved by introduction of concept of a variable. A variable in Pascal - a concrete room for data storage defined
Type. The value (the information in appropriate storage locations) in an ode of performance of the program can be changed. Constants, as you already
Know, the values which value during program performance is changed are named cannot be. Concrete variables and constants represent objects unique and differ from each other a name.
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