In C, what is the difference between a Union and a Struct? Is it possible to create a class in C with a function specifically for that class like in an object oriented language?
E.x. in c# if you have:
public class a{
int a, b;
function add(int a, int b){
return a+b;
}
}
How would you create something similar in c with a struct?

Question

In C, what is the difference between a Union and a Struct? Is it possible to create a class in C with a function specifically for that class like in an object oriented language? 
E.x. in c# if you have:
   public class a{
      int a, b;
      function add(int a, int b){
          return a+b;
    }
  }
How would you create something similar in c with a struct?

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