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Understand the concept of functions with default arguments Define and use Friend functions advantages disadvantage friend classes Describe function overloading various data types different number of arguments | Function Overloading and References Session 3 Session Objectives Understand the concept of functions with default arguments Define and use Friend functions advantages disadvantage friend classes Describe function overloading various data types different number of arguments Object Oriented Programming with C++/ Session 3/ of 35 Session Objectives (Contd.) describe the scope for function overloading Explain the use of reference arguments passing references to functions returning references from functions Define and use Inline functions Object Oriented Programming with C++/ Session 3/ of 35 Functions A function declaration gives: the name of the function the type of the value returned (if any) by the function the number and types of the arguments that must be supplied in a call of the function A function declaration may or may not contain argument names. Possible to call a function without specifying all its arguments. Object Oriented Programming with C++/ Session 3/ of 35 . | Function Overloading and References Session 3 Session Objectives Understand the concept of functions with default arguments Define and use Friend functions advantages disadvantage friend classes Describe function overloading various data types different number of arguments Object Oriented Programming with C++/ Session 3/ of 35 Session Objectives (Contd.) describe the scope for function overloading Explain the use of reference arguments passing references to functions returning references from functions Define and use Inline functions Object Oriented Programming with C++/ Session 3/ of 35 Functions A function declaration gives: the name of the function the type of the value returned (if any) by the function the number and types of the arguments that must be supplied in a call of the function A function declaration may or may not contain argument names. Possible to call a function without specifying all its arguments. Object Oriented Programming with C++/ Session 3/ of 35 Functions with default arguments The function declaration must provide default values for those arguments that are not specified. Whenever a call is made to a function without specifying an argument, the program will automatically assign values to the parameters from the default declaration. void func(int = 1, int = 3, char = '*'); //prototype declaration or void func(int num1,int num2 = 3,char ch = '*'); Object Oriented Programming with C++/ Session 3/ of 35 Default values for arguments Once an argument is given a default value in the list of formal arguments, all of the remaining must have default values also. Only the trailing values can be defaulted. void func(int num1=2,int num2, char ch='+'); //error Default values must be of the correct types or the compiler will issue an error. Default values can be given in either the prototype or the function definition header, but not in both. Highly recommended that the default values be given in the prototype declaration rather than in .
