| constantReference | use of a constant |
| Syntax | A constantReference is:
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| Description | In a Turing program, a constant is declared and given a name (constantId) and then used. Each use is called a constant reference. If the constant is an array, record or union, its parts (components) can be selected using subscripts and field names (using componentSelectors). The form of a componentSelector is one of:
Form (a) is used for subscripting (indexing) arrays. The number of array subscripts must be the same as in the array's declaration. Form (b) is used for selecting a field of a record or union. Component selectors are used in the same manner as variable references. See variableReference for details. See also const declaration and explicitConstant.
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| Example |
var radius : real
const pi := 3.14159 % Constant declaration
…
put "Area is: ", pi * radius **2
% pi is a constant reference.
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