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WSU - CSC 2110 - Study Guide - Midterm

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WSU - CSC 2110 - Study Guide - Midterm

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background image Computer Science Study Guide  Overloading and Templates  Operator overloading : extends definition of an operator to work 
with a user-defined data type.
C++ allows you to extend the definitions of most of the 
operators to work with classes.
Operators such as: 
Relational operators, arithmetic, operators, the insertion 
operator for data output, and the extraction operator for 
data input. 
ASSIGNMENT AND MEMBER SELECTION are the only built in 
operations on classes.
Other operators cannot be applied directly to class objects 
by default. 
Examples of overload operators:  - Arithmetic operator /: if both operands of / are integers, the  result is an integer; otherwise, the result is a floating-point 
number.
- This means that the / operator has one definition when both  operands are integers and another when an operand is a 
floating-point number. 
- Which definition is used depends on the data types of the  operand it is used with.  Extraction operator >> and insertion operator <<: - Have been loaded for various data types, such as int, double, string Operator like + and - : 
The results of + and – are different for integers arithmetic, 
floating-point arithmetic, and pointer arithmetic. 
In order to overload an operator, you must write function(s) to 
define what operation the overloaded operator indicates should 
be performed. 
Operator function :  the function that overloads an operator. 
background image - Use reserved word operator as the function name followed  by the operator to be overloaded.  Syntax of an operator function heading : 
returnType operator operatorSymbol ( formal parameter 
list) 
- The result of an operation is a value. Therefore, the operator  function is a value- returning function. Operator is a reserved
word. 
- To overload an operator for a class:  - - include the statement to declare  the function prototype  to  overload the operator in the class definition.  - =- write the definition of the operator function.  Overloading an operator : some restrictions    you cannot change the precedence of an operator.    The associatvitiy cannot be changed.   For example: the associativity of the arithmetic 
operator addition is from left to right and it cannot be 
changed. 
  Cannot change the number of parameters an operator 
takes
       Cannot create new operators. Only existing  operators can be overloaded.        The operators that cannot be overloaded are:  .   .*    ::   ?:  sizeof

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School: Wayne State University
Department: Computer Science and Engineering
Course: Computer Science I
Professor: Are
Term: Winter 2018
Tags: Computer and Science
Name: Computer Science Test Help
Description: These notes will cover the chapters we have learned and help you prepare for the test
Uploaded: 03/20/2018
4 Pages 28 Views 22 Unlocks
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