Unity text superscript square representation +text judge whether the text is empty

Code

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class textTest : MonoBehaviour
{
    public Text text;
    public Text aText;
    public Text bText;
    public Text cText;
    public Text dText;
    private string valueOfAText;
    private string valueOfBText;
    private string valueOfCText;
    private string valueOfDText;
    private double aValue=0;
    private double bValue =0;
    private double cValue =0;
    private double dValue =0;
    private double resultValue=0;
    // Start is called before the first frame update
    void Start()
    {
        text.text = "D(1)=189.65+69.01A-4.91B+19.99C+5.22D-3.08AB+20.62AC+1.57AD+3.75BC+2.67BD-1.57CD-36.32A" + "\u00B2" + "+0.25B" + "\u00B2" + "-15.8C" + "\u00B2" + "-24.38D" + "\u00B2";

    }


    public bool JudgeValue()
    {
        // Determines if the input value is null 
        valueOfAText = aText.GetComponent<Text>().text.ToString();
        valueOfBText = bText.GetComponent<Text>().text.ToString();
        valueOfCText = cText.GetComponent<Text>().text.ToString();
        valueOfDText = dText.GetComponent<Text>().text.ToString();
        if (IsSpace(valueOfAText))
        {
            Debug.Log("A Edit is empty ");
        }
        else if (!valueOfAText.Equals(""))
        {
            Debug.Log("A Edit is not empty ");
        }
        if (IsSpace(valueOfBText))
        {
            Debug.Log("B Edit is empty ");
        }
        else if (!valueOfBText.Equals(""))
        {
            Debug.Log("B Edit is not empty ");
        }
        if (IsSpace(valueOfCText))
        {
            Debug.Log("C Edit is empty ");
        }
        else if (!valueOfCText.Equals(""))
        {
            Debug.Log("C Edit is not empty ");
        }
        if (IsSpace(valueOfDText))
        {
            Debug.Log("D Edit is empty ");
        }
        else if (!valueOfDText.Equals(""))
        {
            Debug.Log("D Edit is not empty ");
        }
        if(!IsSpace(valueOfAText)&& !IsSpace(valueOfBText) && !IsSpace(valueOfCText) && !IsSpace(valueOfDText))
        {
            return true;
        }else
        {
            return false;
        }
    }



    public void clickComputeBtn()
    {

        // Judge whether the value is empty 
        if(JudgeValue())
        { // Calculation 
            ComputeValue();
        }
       

    }



    public void  ComputeValue()
    {
        
        aValue = Convert.ToSingle(aText.text.ToString());
        bValue = Convert.ToSingle(bText.text.ToString());
        cValue = Convert.ToSingle(cText.text.ToString());
        dValue = Convert.ToSingle(dText.text.ToString());

        if (double.TryParse(aText.text.ToString(), out aValue))
        {
            aValue = Double.Parse(aText.text.ToString());
        }
        if (double.TryParse(bText.text.ToString(), out bValue))
        {
            bValue = Double.Parse(bText.text.ToString());
        }
        if (double.TryParse(cText.text.ToString(), out cValue))
        {
            cValue = Double.Parse(cText.text.ToString());
        }
        if (double.TryParse(dText.text.ToString(), out dValue))
        {
            dValue = Double.Parse(dText.text.ToString());
        }


        resultValue = 189.65 + 69.01 * aValue - 4.91 * bValue + 19.99 * cValue + 5.22 * dValue
            - 3.08 * aValue * bValue + 20.62 * aValue * cValue + 1.57 * aValue * dValue
            + 3.75 * bValue * cValue + 2.67 * bValue * dValue - 1.57 * cValue * dValue
            - 36.32 * aValue * aValue + 0.25 * bValue * bValue - 15.8 * cValue * cValue - 24.38 * dValue * dValue;

        Debug.Log(aValue);
        Debug.Log(bValue);
        Debug.Log(cValue);
        Debug.Log(dValue);
        Debug.Log(resultValue);
    }


    // Detect spaces 
    private bool IsSpace(string textValue)
    {
        if (textValue.Trim().Length == 0)// Remove the spaces at the beginning and end of the string 
        {
            return true;
        }
        return false;
    }






}

Demo picture