Can anyone tell me why it doesn't work? (C++)

Question

include <iostream>
using namespace std;
int skill();

int main() {
int c=skill();
cout<<c;
return 0;
}
int skill(int a=10,int b=10){
int sum= a+b;
return sum;
}

Answer 1

You wrong type function declaration. It does not match the definition you write after main() function

Answer 2

Number and types of parameters must match

Answer 3

EDIT: I missed your declaration of skill() at the top of your file previously.

Your code should be:

#include <iostream>

using namespace std;

int skill(int a=10,int b=10);

int main() {
int c=skill();
cout<<c;
return 0;
}
int skill(int a,int b){
int sum= a+b;
return sum;
}

Answer 4

But if I write "skill" function above int main(), then everything works fine. (I'm new to C++ can't understand why it can't work with "skill" function under int main())

Answer 5

Thank you Xan. Such a simple mistake, but so crucial...