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I am recently studying computer science and I was introduced into boolean algebra. It seems that boolean algebra is used to simplify logic gates in hardware in order to make the circuit design minimal and thus cheaper. Is there any similar way that you can use it to reduce the number of code lines in your software in higher level languages like C++, C# or any other language?

You can use boolean algebra for many things in programming, it is a basic calculation technique like adding, substracting or multiplying numbers. It is a multi-purpose tool, not just a tool for reducing the number of code lines in a program (as well as it is not a tool for just simplifying logic gates in hardware). However, it can sometimes be used for such cases (as well as for the opposite, or for completely different purposes).

For example, if your program contains an overly complicated boolean expression or sequence of conditionals, boolean algebra might help you to simplify the expression and the surrounding code. But that does not necessarily leads to less lines of code. In fact, sometimes complex one-line code snippets get more maintainable when you split them up into several lines of code, and boolean algebra can help you to do this correctly.

So IMHO your question is like "can I use a pocket calculator to find the shortest route when traveling from A to B"? Sure you can, when you take a map with distance information for individual roads and use the calculator to add them up, and then pick the route with the smallest sum. But you could also use the calculator for finding longer routes, or for calculating completely different things.

Boolean algebra is logic reduced to its most basic form. It maps nicely to a binary counting system, the second most basic imaginable counting system.

it seems that boolean algebra is used to simplify logic gates in hardware

Not quite. It makes it possible to implement any kind of logic in hardware in the first place. Once you have that, you can use software to build on that and create more complex logic again.

So no, you do not reduce the number of code lines using boolean algebra. You use it whenever there is a binary choice to be made. If your problem is complex, you are going to have a lot of choices in your software solution.

So it is the other way around: simple logic requires less boolean algebra, complex logic requires more. And more logic == more code.

Well, OK. The reason electronics engineers want to reduce the number of logic gates in a circuit is probably a matter of construction cost and operational performance of their final product. They are building the very thing that will do the work in the end.

When you are programming in any language other than assembly, the computer in the end will not execute your code, but a transformed version of it. This transformation from the programmer friendly language to the computer friendly language may be called «compilation». Boolean logic is indeed used by the compiler to achieve operational efficiency.

You may code in assembly and do the compiler's job yourself, but on a day-to-day basis, it becomes less and less worth the hassle. Modern compilers know more and more of the tricks, and better than you.

On the contrary, if you ask whether there exist a similar practice in higher-level languages, yes, it's called «refactoring», which means applying well-defined transformations to code chat change the structure and not the behaviour. In the 90s, Martin Fowler published a book that is a catalog of probably the most recurring basic refactorings in object languages.

Of course you can use Boolean Algebra for different cases in your project. This technique allows to get the same output with less steps and components when designing a circuit.

However in case of High-level languages it may result in more problems. HLL languages are designed for readability and ease of understanding. You can simplify your several lines of code into a single one, but it will become unreadable and complex, so much more time is required to grasp the idea of the code.
Most of compilers perform such kind of optimizations by default.

All in all, I suggest not to think a lot about reducing lines of code, but consider behavior of the program in runtime, memory usage and architectual design. Generally when you are applying Boolean Algebra to your circuits you are acting as a compiler for most of existing languages.

Yes, you can. But should you?

Boolean algebra serves to reduce logical expressions to their minimal form, but whether this is good or bad is left to the programmer. Let's take this validation code:

...

if (person.Money == 0) return;

if (person.Money != 0 && person.Age < 15) return; 

if (person.Age > 90) return;

if (person.Children > 3) return;

if (person.HasWhiteShirt() && person.HasBlueSocks()) return;

...

This is a list of checks on the object person, and will exit the function as soon as one of those is true. The meaning of that is pretty clear, and anyone that reads it, even a non-programmer, can understand what checks we're doing.

There are different ways to write that, though. Let's go for lines of code and simplify it, as you asked in your question, and see what happens:

if (... || person.Money == 0 || person.Age < 15 || person.Age > 90 || person.Children > 3 || (person.HasWhiteShirt() && person.HasBlueSocks()) || ...) return;

We now have a single line of unreadable conditionals, and by simplifying we also lost the info that that <15 age check is somehow related to money. Editing this code is gonna be way more difficult in the future, so reducing it was a mistake.

In conclusion: Always go for readability, regardless of the minimal form of a logical expression.

Subject: Generating PDF after submitting the survey in Limesurvey ?
Dear all,
I would like to aks how can print out PDF after submitting the survey in Limesurvey ?
Could we use css code for this ?
Many thanks for your help!
Best regards.