public LET(string s) { _type = LETTYPE.STRING; _data = s; }
public LET(int i) { _type = LETTYPE.INT; _data = i; }
public LET(double d) { _type = LETTYPE.DOUBLE; _data = d; }
public LET(string s) { _type = LETTYPE.STRING; _data = s; }
public LET(int i) { _type = LETTYPE.INT; _data = i; }
public LET(double d) { _type = LETTYPE.DOUBLE; _data = d; }