Format Numbers

Part of the Building Real Games section of Coddy's Unity journey. Lesson 3 of 60.

A number joined to a string comes out the way C# writes it: a timer shows 12.34567, and a float that is 2 shows 2, with no decimals at all. A format string in ToString() decides how it looks instead. Each 0 in it stands for a digit that is always written: 7.ToString("000") is 007, and 41.27f.ToString("0.0") is 41.3, rounded to one decimal. In string interpolation the same format goes after a colon: $"{coins:000}", $"{topSpeed:0.0} m/s".

Times read better as minutes and seconds. Cast the time to int first, which drops the fraction; then integer division by 60 gives the whole minutes and % 60 the seconds left over. A lap of 83.46 seconds:

float lapTime = 83.46f;
int total = (int)lapTime;      // 83
int minutes = total / 60;      // 1
int seconds = total % 60;      // 23
lapText.text = $"Lap: {minutes}:{seconds:00}";   // Lap: 1:23

The 00 keeps two digits: without it, a lap of 64 seconds would read 1:4 instead of 1:04. And because (int) drops the fraction instead of rounding, 59.7 seconds shows as 0:59; rounding would show 0:60 for a moment.

Challenge

Easy

Format the arcade's three numbers.

In Update(), first add int seconds = (int)playTime;.
Show the score in six digits, Score: 000450, with {score:000000}, and the combo with one decimal, Combo: x2.5, with {combo:0.0}.
Show the time as Time: 2:07: seconds / 60, a colon, then seconds % 60 in two digits.

Press Play and press Space: the score keeps six digits. Then Check.

Try it yourself

using UnityEngine;
using TMPro;

public class Scoreboard : MonoBehaviour
{
    public TMP_Text scoreText;
    public TMP_Text comboText;
    public TMP_Text timeText;
    public int score;
    public float combo = 1f;
    public float playTime;

    void Update()
    {
        playTime += Time.deltaTime;
        if (Input.GetKeyDown(KeyCode.Space))
        {
            score += (int)(100 * combo);
            combo += 0.5f;
        }

        scoreText.text = "Score: " + score;
        comboText.text = "Combo: x" + combo;
        timeText.text = "Time: " + playTime;
    }
}