Sample01.cs

public class Sample01 {
  // private type.
  private int    n1 = 10;
  private float  n2 = 10.0f;
  private string s1 = "文字を書けるよ！";
  
  // public type.
  public int    n3 = 10;
  public float  n4 = 10.0f;
  public string s2 = "文字を書けるよ！";
}

public class Sample01 {
  
  private int n1 = 10;
  private int n2 = 10;
  private int sub = 0;
  
  // UnityではデフォルトでStart関数とUpdate関数がある
  private void Start () {
    sub = n1 + n2; 
  }
}