The compiler throws a c++ error, what should I fix?

Question

C++ / C#

I just started writing a program, but the code is no longer compiled, I don’t understand what is written incorrectly, tell me what to fix

Answer 1

0. The code must be inserted as text in a special tag, not as an image.
1. You misused the comma operator , it doesn't work like that and
cin >> a, b, c;
it won't read the values ​​of a, b and c as you would like.
It is correct to write like this:
cin >> a >> b >> c;

Answer 2

with uninitialized. It is necessary not to list through a comma, but through >>. The comma simply allows expressions to be combined.