How do I add a sprint recharge

Questions & Answers
1

I have a basic sprint script that allows the player to walk using “W” run using “Shift” and Crouch using “c”. As the player sprints the stamina goes down. And it stays down. I want it to go back up to 100 so the player can sprint again. here is the script

var walkSpeed: float = 8;
var crchSpeed: float = 3;
var runSpeed: float = 16;
var stamina : int = 100;
 
private var chMotor: CharacterMotor;
private var ch: CharacterController;
private var tr: Transform;
private var height: float;
 
function Start() {
    chMotor = GetComponent(CharacterMotor);
    tr = transform;
    ch = GetComponent(CharacterController);
    height = ch.height;
}
 
function Update() {
    var h = height;
    var speed = walkSpeed;
    if (ch.isGrounded && Input.GetKey("left shift") || Input.GetKey("right shift")) {
        if (stamina != 0) {
            speed = runSpeed;
            stamina = stamina - 1;
        }
    }
    if (Input.GetKey("c") || Input.GetKey("c")) {
        h = 0.5 * height;
        speed = crchSpeed;
    }
    chMotor.movement.maxForwardSpeed = speed;
    var lastHeight = ch.height;
    ch.height = Mathf.Lerp(ch.height, h, 5*Time.deltaTime);
    tr.position.y += (ch.height-lastHeight)/2;
 
    if (stamina != 100) {
            stamina = stamina + 0.5;
        }
}
 
function OnGUI () {
    GUI.Box(Rect(120,Screen.height - 50, 80, 40), "");
    GUI.Label(Rect(130,Screen.height - 30, 180, 125), stamina + " / " + "100");
    GUI.Label(Rect(130,Screen.height - 50, 180, 125), "Stamina");
}
2

In line 36, try :

if(stamina < 100)

instead of :

if(stamina != 100)