classes, namespaces and declaring variables in C# for Unity

Day1:

I learned about classes, namespaces and declaring variables…

1st Program:

using System.Collections;
using System.Collections.Generic; 
using UnityEngine; 
 
public class Test : MonoBehaviour 
 
{ 
 
    Rigidbody2D _rb; 
 
    float _walkspeed; 
    float _inputHorizontal; 
 
    // Start is called before the first frame update 
    void Start() 
    { 
        _rb = gameObject.GetComponent<Rigidbody2D>(); 
 
        _walkspeed = 5.5f; 
    } 
 
    // Update is called once per frame 
    void Update() 
    { 
        _inputHorizontal = Input.GetAxisRaw("Horizontal"); 
 
        if(_inputHorizontal != 0) 
        { 
            _rb.AddForce(new Vector2(_inputHorizontal * _walkspeed, 0f)); 
        } 
    } 
}

From above program:

System.Collections;
System.Collections.Generic; 
UnityEngine;

• These are called namespaces. Simply namespace is the collection of classes… We can say them library also…

public class Test : MonoBehaviour

• MonoBehaviour is the class which is inside the namespace named UnityEngine and now we can access void Start() and void Update() which is also simply the syntax of class MonoBehaviour…

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