Hi,
I am a working professional I usually get time to do workout but don't get time to make my diet so, in this case, what should I do? I mean is it possible to make muscles without a diet?
There is always "time" for your diet.
Question already answered above by mike, but you need to better utilize your meal prep time, or if you eat out, there are ways to handle this. Wake up 15 mins earlier, onto bed 15 mins later, add 30 mins there to preperation.
Prepare more than 1 meal at a time for the next day or two. Grill 4, 5 or 6 chicken breasts for the next day. A full pot of brown rice or white or what ever.
Eating out, ask for grilled veggies, grilled chicken instead of fried, boiled eggs ect ect. Pay attention to condiments, full of shit you don't need, but they are calories if that's what you want.
Keep peanut butter at work for snacks, put onto some triscuits or something.
Point is, if you pay attention to your day and schedule, you can always find ways to improve the diet if you really want too.
For better help it would be beneficial to know your stats and goal. Are you trying to just get stronger, more muscular and defined, just bigger arms, whatever.... but details can help others nail down a better plan for you, give better and more directed advice for your goal and will help you improve where you want to, faster.