By: Akshay Chavan
In foo.h 1 void printvalues(int x, int y=10); Shouldn’t it be 1 void printValues(int x, int y=10);
View ArticleBy: blaze077
"Note that it is impossible to supply a user-defined value for z without also supplying a value for x and y." This function refers to printValues(int x, int y, int z) so I think the sentence should be:...
View ArticleBy: Kess
Actually, I believe it was correct in it’s former version, as in order to provide the value only for x you could just write printValues(3); and the function would be called with 3, 20 and 30 as its...
View ArticleBy: Alex
Agreed -- I’ve updated and clarified the text to be clearer that I was talking about arguments, not parameters. 🙂
View ArticleBy: nikos-13
"void printStringInColor(std::string, Color color=COLOR_BLACK); // Color is an enum" You forgot the parameter’s, of type std::string, name.
View ArticleBy: Alex
Fixed. Even though providing the name of the parameters is optional in a function prototype (only the type is required), it’s a good practice to do so.
View ArticleBy: Nakamura
How does it work for map? I have a map "std::map<int,std::string> map" , how will it work for optional parameter ?
View ArticleBy: nascardriver
Hi Nakamura! An std::map can be initialized with empty curly braces 12345678910111213141516 #include <iostream>#include <map>#include <string> void fn(std::map<int,std::string>...
View ArticleBy: Marcus
Is there an explicit way to use the default value? e.g printValues(-1, *, -1) where '*' means that I would like to use the default value. Output: Values: -1 20 -1
View ArticleBy: nascardriver
Hi Marcus! The only way to use default arguments is not setting them at all.
View ArticleBy: Alex
Short answer: no. Default values can only be invoked for the rightmost parameters in a call, and are invoked by not passing an argument for that parameter in the function call.
View ArticleBy: Trevor
I should probably try it, but I would think that if a function has default arguments and is called from a different CPP file, then the default values would need to be in the function prototype. My...
View ArticleBy: jayu
char name[10]; //I want to enter default value of name like "name= jayu"how I can do that please send me syntax of this.jayupipaliya198@gmail.com
View ArticleBy: nascardriver
Hi Jayu! 123 const char *szName{ "jayu" }; // Immutable (Can't be modified)// Orchar arrName[4]{ "jayu" }; // Mutable (Can be modified)
View ArticleBy: Alex
I believe you are correct. This is generally avoided by putting your function prototypes in a header and #including that header wherever you need access to the function. That way you only have a single...
View ArticleBy: Peter Baum
1. Is there any good reason why C++ does not support more flexible default values such as 1 printValues(,,3) and 1 void printValue(int x=10, int y); ? 2. It seems strange that “Once declared, a default...
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