Default arguments syntax and general syntax in c++

Question

What is the difference between below function prototype declarations?

int a(double = 0, double = 10); int a(double j = 0, double a = 10);

In your last edit, you introduced a syntax error: I doubt that void f(double = 0, double = 5, int ) will compile without complaints. (Last parameter without default!) — Scheff's Cat
– Scheff's Cat, Commented Aug 8, 2019 at 11:09
@Alex Stacy This declaration void f(double = 0, double = 5, int) is invalid. — Vlad from Moscow
– Vlad from Moscow, Commented Aug 8, 2019 at 11:10
Don't change the original question into another one completely different. It makes the already given answers obsolete. Writing "read the question again" is not sufficient. — Fareanor
– Fareanor, Commented Aug 8, 2019 at 11:11
For the records: void f(int x, int y); and void f(double, double, int)... are unrelated. Read about polymorphism -> Overloading concerning this. — Scheff's Cat
– Scheff's Cat, Commented Aug 8, 2019 at 11:12

Aykhan Hagverdili · Accepted Answer · 2019-08-08 11:01:27Z

These are both function declarations. Parameter names in function declarations are purely for documentation. So there is no technical difference.

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