How can i use a button key click to switch/toggle between enum options ?

Question

I want that once i click on F it will call Formation Square and another click on F will call the Formation Circle then another click on F Square,Circle....

And when it's calling/using Square to call/use the method FormationSquare and when Circle then calling/using RandomCircle.

Instead the switch/case to use If/Else the enum and the key code F. Or maybe using switch/case is better but the idea is to use the key F for toggling between FormationSquare and RandomCircle.

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class SquadFormation : MonoBehaviour
 {
     enum Formation
     {
         Square, Circle
     }
 
     public Transform squadMemeber;
     public int columns = 4;
     public int space = 10;
     public int numObjects = 20;
     public float yOffset = 1;
 
     // Use this for initialization
     void Start()
     {
         ChangeFormation();
     }
 
     // Update is called once per frame
     void Update()
     {
         if (Input.GetKeyDown(KeyCode.F))
         {
 
         }
     }
 
     private void ChangeFormation()
     {
         Formation formation = Formation.Circle;
 
         switch (formation)
         {
             case Formation.Square:
 
                 for (int i = 0; i < 23; i++)
                 {
                     Transform go = Instantiate(squadMemeber);
                     Vector3 pos = FormationSquare(i);
                     go.position = new Vector3(transform.position.x + pos.x, 0, transform.position.y + pos.y);
                     go.Rotate(new Vector3(0, -90, 0));
                 }
                 break;
 
             case Formation.Circle:
 
                 Vector3 center = transform.position;
                 for (int i = 0; i < numObjects; i++)
                 {
                     Vector3 pos = RandomCircle(center, 5.0f);
                     var rot = Quaternion.LookRotation(pos - center);
                     pos.y = Terrain.activeTerrain.SampleHeight(pos);
                     pos.y = pos.y + yOffset;
                     Instantiate(squadMemeber, pos, rot);
                 }
                 break;
         }
     }
 
     Vector2 FormationSquare(int index) // call this func for all your objects
     {
         float posX = (index % columns) * space;
         float posY = (index / columns) * space;
         return new Vector2(posX, posY);
     }
 
     Vector3 RandomCircle(Vector3 center, float radius)
     {
         float ang = Random.value * 360;
         Vector3 pos;
         pos.x = center.x + radius * Mathf.Sin(ang * Mathf.Deg2Rad);
         pos.z = center.z + radius * Mathf.Cos(ang * Mathf.Deg2Rad);
         pos.y = center.y;
         return pos;
     }
 }

Answer 1

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class SquadFormation : MonoBehaviour
 {
     enum Formation
     {
         Square, Circle
     }
 
     public Transform squadMemeber;
     public int columns = 4;
     public int space = 10;
     public int numObjects = 20;
     public float yOffset = 1;
 
     // *NEW* create global variable
     private Formation formation;
 
     // Use this for initialization
     void Start()
     {
         // *NEW* initialize formation
         formation = Formation.Square;
         ChangeFormation();
     }
 
     // Update is called once per frame
     void Update()
     {
         if (Input.GetKeyDown(KeyCode.F))
         {
             // *NEW* 
             ChangeFormation();
         }
     }
 
     private void ChangeFormation()
     {
         // *NEW* delete the local variable declaration
         // Formation formation = Formation.Circle;
 
         switch (formation)
         {
             case Formation.Square:
 
                 for (int i = 0; i < 23; i++)
                 {
                     Transform go = Instantiate(squadMemeber);
                     Vector3 pos = FormationSquare(i);
                     go.position = new Vector3(transform.position.x + pos.x, 0, transform.position.y + pos.y);
                     go.Rotate(new Vector3(0, -90, 0));
                 }
                 // *NEW* toggle formation
                 formation = Formation.Circle;
                 break;
 
             case Formation.Circle:
 
                 Vector3 center = transform.position;
                 for (int i = 0; i < numObjects; i++)
                 {
                     Vector3 pos = RandomCircle(center, 5.0f);
                     var rot = Quaternion.LookRotation(pos - center);
                     pos.y = Terrain.activeTerrain.SampleHeight(pos);
                     pos.y = pos.y + yOffset;
                     Instantiate(squadMemeber, pos, rot);
                 }
                 // *NEW* toggle formation
                 formation = Formation.Square;
                 break;            
         }
     }
 
     Vector2 FormationSquare(int index) // call this func for all your objects
     {
         float posX = (index % columns) * space;
         float posY = (index / columns) * space;
         return new Vector2(posX, posY);
     }
 
     Vector3 RandomCircle(Vector3 center, float radius)
     {
         float ang = Random.value * 360;
         Vector3 pos;
         pos.x = center.x + radius * Mathf.Sin(ang * Mathf.Deg2Rad);
         pos.z = center.z + radius * Mathf.Cos(ang * Mathf.Deg2Rad);
         pos.y = center.y;
         return pos;
     }
 }

How can i use a button key click to switch/toggle between enum options ?

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