Where should I write the default parameter? In the function declaration? In the function definition? Or both?
The code that people wrote down I think they all wrote whatever they wanted Is there any rule?
c++ default-argument
The default parameter must appear in the function declaration. That way, you can see it when you call a function from another location.
If you declare the header file without default parameters,
If you write the default parameter while defining the function in A.cpp
Other places, such as B.cpp, do not know that the default parameter is present.
//myheader.hpp
void myfunc(int nonDefault, float Default);
/******* File sharing ********/
//A.cpp
int myfunc(int nonDefaultParam, float DefaultParam=3){
cout << "hello" << endl;
return 1;
}
void funcA(){
myfunc(3); //ok
myfunc(3, 3.0); //ok
}
/******* File sharing ********/
//B.cpp
void funcA(){
myfunc(3); //error!!!!!!!!!!!
myfunc(3, 3.0); //ok
}
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