MG42 problem

I adding a MG42,but use an ammos (normal ammo,shells). How to fixed not use an ammos? 

WL_AGENT.CPP:

Code:

case -1:
                ob->state = &s_player;
                if (!gamestate.ammo && gamestate.weapon == wp_pistol ||
                    !gamestate.ammo && gamestate.weapon == wp_machinegun ||
                    !gamestate.ammo && gamestate.weapon == wp_chaingun ||
                    !gamestate.shells && gamestate.weapon == wp_flakgun ||
               !gamestate.fuel && gamestate.weapon == wp_flame)
                {
                    gamestate.weapon = gamestate.chosenweapon = wp_knife;
                    DrawWeapon ();
                }
                else
                {
                    if (gamestate.weapon != wp_mg42_mounted &&
                        gamestate.weapon != gamestate.chosenweapon)
                    {
                        gamestate.weapon = gamestate.chosenweapon;
                        DrawWeapon ();
                    }
                }
                gamestate.attackframe = gamestate.weaponframe = 0;
                return;

            case 4:
         case 6:
                if (!gamestate.ammo && !gamestate.shells && !gamestate.fuel)
                    break;
                if (buttonstate[bt_attack])
                    gamestate.attackframe -= 2;
            case 1:
                if (!gamestate.ammo && gamestate.weapon == wp_pistol ||
                    !gamestate.ammo && gamestate.weapon == wp_machinegun ||
                    !gamestate.ammo && gamestate.weapon == wp_chaingun ||
                    !gamestate.shells && gamestate.weapon == wp_flakgun ||
               !gamestate.fuel && gamestate.weapon == wp_flame)
                {      // can only happen with chain gun
                    gamestate.attackframe++;
                    break;
                }
                GunAttack (ob);
                if (gamestate.chosenweapon == wp_pistol)
                {
                    gamestate.ammo--;
                    DrawAmmo ();
                }
                if (gamestate.chosenweapon == wp_machinegun)
                {
                    gamestate.ammo--;
                    DrawAmmo ();
                }
                if (gamestate.chosenweapon == wp_chaingun)
                {
                    gamestate.ammo--;
                    DrawAmmo ();
                }
                if (gamestate.chosenweapon == wp_flakgun)
                {
                    gamestate.shells--;
                    DrawAmmo ();
                }
                break;
               
            case 2:
                KnifeAttack (ob);
                break;

            case 3:     
                if (gamestate.ammo && buttonstate[bt_attack])
                    gamestate.attackframe -= 2;
                break;
            
         case 5:     
                if (buttonstate[bt_attack])
                    gamestate.attackframe -= 4;
                break;       
               
            case 7:
                if (gamestate.shells && buttonstate[bt_attack])
                    gamestate.attackframe -= 2;
                break; 

I don't know the specifics of Wolfenstein 3D coding, but somebody on Diehard Wolfers commented to you to start coding a mod from scratch & fix one problem at a time.  But I'm more interested in learning to edit sprites than to edit code, so I hope I'm not naive.  I'm sorry I don't know how to help you more. 

DHW forum? No!!!! I leave permanently from DHW forum. My definitive leave new:http://diehardwolfers.areyep.com/viewtopic.php?t=7310