I need help converting the variable "r" to a float.

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

public class Calculate : MonoBehaviour
{
    double pi = 3.14159;
    public InputField r;
    public Text circumference;
    public Text area;

    public void calculate()
    {

        circumference.text = ("Circumference = "   2 * pi * r);
    }
}

I have tried using the TryParse method and Parse Method, They don't work or i'm not using them correctly. I left the code how I originally coded it.

If you can fix this please reply with an answer.

CodePudding user response：

float rF = float.Parse(r.text);

Remember about error handling, and making sure the input is always a float. Otherwise, use TryParse.

CodePudding user response：

What did happen when you used parse? This following example does what you want.

Note the CultureInfo.InvariantCulture in the conversion from and to string. It prevents conversion between . and , that could happen depending on your locale.

I'd recommend you use longer variable names for clarity in the future but of course that is up to you.

using System;
using System.Globalization;
using UnityEngine;
using UnityEngine.UI;

public class CalculateCircle : MonoBehaviour
{
    private double pi = 3.14159;
    public InputField r;
    public Text circumference;
    public Text area;

    private void Start()
    {
        r.onEndEdit.AddListener(delegate { Calculate(); });
    }

    public void Calculate()
    {
        float radius = 0;
        try
        {
            radius = float.Parse(r.text);
        }
        catch (Exception ex)
        {
            Debug.Log(ex.Message);
        }

        double circumferenceValue = 2 * pi * radius;
        double areaValue = pi * radius * radius;
        circumference.text = circumferenceValue.ToString(CultureInfo.InvariantCulture);
        area.text = areaValue.ToString(CultureInfo.InvariantCulture);
    }
}