public While_Trad(Expresion_Trad condition, Sentence_Trad sentences, int ct)
     : base(0, 0, "While")
 {
     this.condition = condition;
     this.sentences = sentences;
     this.cant_tabs = ct;
 }
 //ESTE ES EL ELSE-CASE
 public Case_Trad(Sentence_Trad code, int cant_tabs)
     : base(0, 0, "Case")
 {
     this.sentence  = code;
     this.isNull    = false;
     this.isElse    = true;
     this.cant_tabs = cant_tabs;
 }
 public Case_Trad(Expresion_Trad condition, Sentence_Trad code, int ct)
     : base(0, 0, "Case")
 {
     this.condition = condition;
     this.sentence  = code;
     this.isNull    = false;
     this.isElse    = false;
     this.cant_tabs = ct;
 }