Nested loops can be a headache, but here's how I think about them: the outer loop controls rows, the inner loop handles what's in each row. For patterns like these, start by figuring out how many rows you need and what changes between them. Then, focus on one row at a time - what number are you printing, and how many times? The outer loop usually sets up the number, while the inner loop prints it. Don't sweat it if it doesn't click right away. Start with simpler patterns and work your way up. Play around with the loops, changing values to see what happens. It'll start making sense with practice. More on reddit.com

What a weird question, so articulate, almost ChatGPT like. Maybe you need to learn about for and while loops better before trying to address nested loops as if they are the next level of learning. They are used then THEY NEED to be used really. Nothing else. One use case would be lets say a two dimensional array, they can be looked as a grid. If you wanted to print each member of the array you'd need two loops, one that has one variable that targets a row and another loop inside that one that targets a column, printing the x,y value on the array. You can read about multi dimensional arrays on many webpages just by googling them. This one has information about it including your very dreaded "nested loop" as an example https://www.w3schools.com/c/c_arrays_multi.php More on reddit.com

Loops like you're 5: A loop is a way to tell the computer to do something specific repeatedly. For instance, if you were a (human) computer and I told you to walk to the end of the street and back until you have done so three times; this is a loop. It's a specific instruction done repeatedly. Loops don't always have an end. If I told you (as a computer) to walk to the end of the street and back until I tell you to stop; if suddenly I decide to move to France while you're walking back and forth, this is an example of a potential infinite loop. I may come back to visit and tell you to stop. You may keep going until you keel over. Nested loops like you're 5: If a loop is a set of specific instructions done repeatedly, what happens if you put a loop in a loop? Well, one of those loops has to finish entirely before the other can continue again. If I told you to walk down to the end of the street 3 times and back, but when you get halfway back, stop and touch your nose 5 times before you start again; this is a nested loop. You may say to yourself "but wait, I can touch my nose while I'm walking, why do I need to stop?" and you would be right, but what we need to realize about computers is that because of how they work, they can only do one thing at a time. (see below before any objections) Computers work in steps. Do A, then do B, then do C. Loops allow us to say "but do X over and over again." You may then say "but how come I can browse reddit, listen to music, and download stuff at the same time on my computer?" and this moves into the concepts of concurrency, or in simpler terms, making the computer do lots of different things at the same time. Things like this exist because we may want a loop to be indefinite, or to end when we tell it to end. Lots of things in the computer world depend on infinite loops, including browsing Reddit (for server side web services, some web browsing features) and video games (rendering and game logic loops). This is where concurrency and asynchronous operations come into play, but this is beginning to get out of the scope of the question, so I'll stop it here (unless you're interested). tl;dr More on reddit.com

Maybe scanf is what you're looking for. More on reddit.com