function ToggleCam()
{
 cam_num += 1;
 cam_num %= 6;
}
on_f4 = ToggleCam;

action Cam_1 //Action der Cam Entity für die erste Sequenz
{
	my.passable = on;
	my.invisible = on;
	mouse_mode=2;
	while(1)
	{

		if(cam_num==0)
		{
			vec_set(camera.x,my.x);
			vec_set(camera.pan,my.pan);
		}
	wait(1);
	}
}

action Cam_2 //Action der Cam Entity für die erste Sequenz
{
	my.passable = on;
	my.invisible = on;
	 
	while(1)
	{
		if(cam_num==1)
		{
			vec_set(camera.x,my.x);
				vec_set(camera.pan,my.pan);
		}
	wait(1);
	}
}

void cam_global(){
}

void cam_player(){
}

void main(){

   //...
  while(1){
    
    switch(cam_to_do){
      case 1:
        cam_global();
      case 2:
        cam_player();
    }
    wait(1);
  }
}

#include <acknex.h>

#define STATE_1 1
#define STATE_2 2

// Variable initialisation
var current_state = STATE_1;

void main()
{
   ...
   while(1)
   {
      if (key_...)
      {
         current_state = STATE_1 ;
      }
      else if ( key_... )
      {
         current_state = STATE_2 ;
      }
      
      ...

      switch (  current_state )
      {
         case STATE_1:
            ...
            break;
         case STATE_2:
            ...
            break;
      }
   }
   ...
}