- Declare a function
To declare a function without identifying the argument list, you can do it in this way:
void say hello(...);
here, you use three point (...) to indicate that the function have no argument.
- function overloading
Keep in mind that the signature, not the function type, enables function overloading. For example, the following two declaration are incompatible:
long gronk (int n, float m); #1 //same signature
double gronk(int n, float m); #2 //hence not allowed
why, for example, if this is possible:
int hel=0;
float haa=3;
gronk(hel, haa); //which function to use, #1 or #2, it is conflict.
therefore, C++ doesn‘t allow you to overload gronk() in this fashion. You can have different return type, but only if the signature are also different, for example:
long gronk(int n, float m);
double gronk(double n, double m); //now it is allowed