how to get the pouse position for transform in unity code example

Example: unity c# transform position

GameObject myObject;
// Change the position of myObject like this:
myObject.transform.position = new Vector3(x, y, z);
// Change position of GameObject that this script is attatched to:
transform.position = new Vector3(x, y, z);
// Read the x, y and z positions of myObject:
Debug.Log("x : " + myObject.transform.position.x);
Debug.Log("y : " + myObject.transform.position.y);
Debug.Log("z : " + myObject.transform.position.z);