Read e-book online Object-Oriented Type Systems PDF

By Jens Palsberg

ISBN-10: 047194128X

ISBN-13: 9780471941286

Object-Oriented sort structures Jens Palsberg and Michael I. Schwartzbach Aarhus collage, Denmark sort structures are required to make sure reliability and potency of software program. For object-oriented languages, typing is a particularly demanding challenge due to inheritance, project, and overdue binding. current languages hire varied variety structures, and it may be tough to check, evaluation and enhance them, because there's at present no uniform conception for such languages. This e-book offers this kind of thought. The authors assessment the kind structures of Simula, Smalltalk, C++ and Eiffel and current a kind procedure that generalizes and explains them. the idea is predicated on an idealized object-oriented language known as BOPL (Basic item Programming Language), containing universal positive aspects of the above languages. a sort process, kind inference set of rules, and typings of inheritance and genericity are supplied for BOPL. all through, the implications are concerning the languages on which BOPL is predicated. this article bargains complex undergraduates software program builders a legitimate realizing of the foremost points of object-oriented sort platforms. All algorithms are applied in a freely to be had workbench, including huge, immense functional worth. a variety of workouts and a transparent writing variety will improve its attract the scholar.

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The result would be 26. You can use parentheses to change the precedence of operations: (6 + 4) * 5 In this expression, the addition is evaluated first because the parentheses have higher precedence than the other operators. The addition evaluates to 10, which is multiplied by 5, giving the result 50. 0; These operators are called binary operators because they operate on two operands. 3-6-2 The Modulus Operator (%) The modulus operator (%) is used to get the remainder of division. For example, the following expression: 5 % 2 gives the result 1, while the expression: 4 % 2 gives the result 0.

The statement: x %= y; means divide x by y and store the remainder of the division in y. 3-6-4 Increment and Decrement Operators (++, ––) Increment and decrement operators are classified as unary or primary arithmetic operators because they have only one operand. Consider the fol lowing statements: x++; y--; The first statement increments the value of x by 1, while the second decrements the value of y by 1. The value of the expression that contains this kind of operator changes according to whether the ++ or –– operator comes before (prefix) or after (postfix) the variable.

2-3 Using Local Variables Local variables are declared inside methods. You can use local variables to store data of various types. WriteLine("The string is: " + myString); Following is a program that uses a local variable and a text message. cs // Local variables. WriteLine("The string is: "+ myString); } } Output: The string is: Hello, World! The C# language contains many numeric data types, which are explained in the following chapters. For example, you can declare an integer variable like this: int myInt; You can also declare and initialize the variable in the same statement: int myInt = 123; As you can see in the example, to initialize a variable you actually assign it an initial value.

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Object-Oriented Type Systems by Jens Palsberg

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