AlliedModders - [TUT/INFO] Condition operator aka ? and :

Ok. I saw few scripters using this function so I decide to make this little tutorial.

Intro
? and : can be a very usefull function...i'll explain a bit:

Code:

condition ? expresion1 : expresion2

1. if condition is true, the function will asses expresion1
2. if condition is false, the function will asses expresion2

Example:

PHP Code:


		
			
// condition operator
is_user_alive(index) ? /* alive */ : /* dead */

// if statement
if(is_user_alive(index))
      /* alive */
else

      /* dead */

How to use this function in code

1. An example for printing a kill/kills:

PHP Code:


		
			
new g_Kills[33];

public plugin_init() 
    register_event("DeathMsg","hook_death","a");

public hook_death()
{
    new k = read_data( 1 );
    g_Kills[k]++;
    
    static kname[32];
    get_user_name(k, kname, sizeof kname - 1);
    

      // condition operator
    server_print("%s: %d kill%s", kname, g_Kills[k] == 1 ? "" : "s");

      // if statement
    if(g_Kills[k] == 1)
             server_print("%s: %d kill", kname, g_Kills[k]);
    else
             server_print("%s: %d kills", kname, g_Kills[k]);
}

If it was his first kill will print: "Player: 1 kill", otherwise "Player: 5 kills"

2. Depending on admins activity cvar:

PHP Code:


		
			
new pointer;

public plugin_init()
{
    register_concmd("amx_example","example", ADMIN_BAN);
    pointer = get_cvar_pointer("amx_show_activity");
}

public example(id)
{
    if(!access(id,ADMIN_BAN))
        return PLUGIN_HANDLED;
    
    new name[32];
    get_user_name(id, name, sizeof name - 1);
    
    // condition operator
    client_print(0, print_chat,"ADMIN %s: Shows an example",get_pcvar_num(pointer) == 2 ? name : "");
   
     // if statement
    if(get_pcvar_num(pointer) == 2)
              client_print(0, print_chat,"ADMIN %s: Shows an example",name);
    else if(get_pcvar_num(pointer) == 1)
              client_print(0, print_chat,"ADMIN : Shows an example");

    // switch statement
    switch(get_pcvar_num(pointer))
    {
              case 2: client_print(0, print_chat,"ADMIN %s: Shows an example",name);
              case 1: client_print(0, print_chat,"ADMIN : Shows an example");
    }

    return PLUGIN_HANDLED;
}

"ADMIN Player: Shows an example" or "ADMIN : Shows an example"

3. I saw script posted about a week ago wich won't let a player to use 'say' command:

PHP Code:


		
			
new bool:g_Gag[33];

public plugin_init()
    register_clcmd("say","hook_say");
    
public check(id)
{
    if(g_Gag[id])
        return PLUGIN_HANDLED;
    return PLUGIN_CONTINUE;
}

This can be write more simple, like this:

PHP Code:


		
			
new bool:g_Gag[33];

public plugin_init()
    register_clcmd("say","hook_say");
    
public hook_say(id)
        return g_Gag[id] ? PLUGIN_HANDLED : PLUGIN_CONTINUE;

This is a simplistic explenation.