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Programming Articles
Page 2204 of 2547
Practice Questions on Time Complexity Analysis in C++
Time complexity of any algorithm is the time taken by the algorithm to complete. It is an important metric to show the efficiency of the algorithm and for comparative analysis. We tend to reduce the time complexity of algorithm that makes it more effective.Example 1Find the time complexity of the following code snippetsfor(i= 0 ; i < n; i++){ cout
Read MoreWhat happens if we try to extend a final class in java?
In Java final is the access modifier which can be used with a filed class and a method.When a method if final it cannot be overridden.When a variable is final its value cannot be modified further.When a class is finale it cannot be extended.Extending a final classWhen we try to extend a final class that will lead to a compilation error saying “cannot inherit from final SuperClass”ExampleIn the following Java program, we have a final class with name SuperClass and we are trying to inherent it from another class (SubClass).final class SuperClass{ public void display() { ...
Read MoreWhy can't we use the "super" keyword is in a static method in java?
A static method or, block belongs to the class and these will be loaded into the memory along with the class. You can invoke static methods without creating an object. (using the class name as reference).Where the "super" keyword in Java is used as a reference to the object of the superclass. This implies that to use "super" the method should be invoked by an object, which static methods are not.Therefore, you cannot use the "super" keyword from a static method.ExampleIn the following Java program, the class "SubClass" contains a private variable name with setter and getter methods and an ...
Read MoreHow to create standalone Lua executables?
We can create standalone Lua executables with the help of the third party packages like srlua.srlua does a perfect job in converting a Lua script file into an executable, and we can do it on both the major platforms, whether that is the windows or the Unix based systems.Let’s first learn how to do it on a Windows system.Consider the steps mentioned below as a reference −First, visit the github link of the srlua project. Please click the following link. After that, you need to clone the repository on your local windows machine with this command −git clone https://github.com/LuaDist/srlua.gitIt should ...
Read MoreHow to convert JSON string into Lua table?
When working with JSON we generally need to decode JSON into a string or maybe encode a string into JSON. Both of these processes of converting the string into a JSON or the opposite are seen frequently.While Lua doesn’t provide an official library to do the same, we can still make use of the third party libraries.There are many third party libraries that we can make use of, out of these the most common one is the json-lua library which can be located on this link.We can either clone the repository on our local machine and then install it or ...
Read MoreHow to compile embedded Lua code in C?
We know that Lua does a great job when it comes to being a simple language and an embedded language. Lua works even better with C, because of the different libraries that provide a great amount of support for it.In order to compile embedded Lua in C, we need to first write a Lua program followed by a C program that will invoke the Lua program function, and then we will compile the C program.Consider the program shown below as the Lua program −print("--I am using Lua from within C--")It should be noted that the above Lua script should be ...
Read MoreHow to Compile a Lua Executable?
While there are different ways with which a person can compile a Lua executable, some of them require more time and resources.The most basic approach is to set the Lua Path environment variable and then simply run the lua command. While this might seem to be not much of a pain, setting the Lua Path definitely requires some work.Instead of setting the Lua path, we can simply make use of the env and lua combination which will allow us to convert a Lua file into an executable or run a Lua script.The command shown below does the same −#!/USR/BIN/ENV LUAIn ...
Read MoreHow to Call a Lua function from C?
Calling a Lua function from C is something that requires a series of steps and a mastery in the Lua library functions. Lua provides several library functions that we can use whenever we want to call Lua functions from C or the opposite.Some of the most commonly used Lua library functions for calling a Lua function from C are −luaL_dofile(L, "myFile.lua");lua_getglobal(L, "add");lua_pushnumber(L, a);and much more.We will make use of these functions when we will call a Lua function from C.The first step is to shut down the Lua interpreter and for that we need to write a code in C.ExampleConsider ...
Read MoreCommand Line arguments in Lua
Handling command line arguments in Lua is one of the key features of any programming language. In Lua, the command line arguments are stored in a table named args and we can use the indices to extract any particular command line argument we require.Syntaxlua [options] [script [args]]The options are −-e stat− executes string stat;-l mod− "requires" mod;-i− enters interactive mode after running script;-v− prints version information;--− stops handling options;-− executes stdin as a file and stops handlingoptions.ExampleLet’s consider an example where we will open a Lua shell in interactive mode and we will pass the script as dev/null and then we ...
Read MoreCode indentation in Lua Programming
Lua codes are not like Python when it comes to indentation. So, most of the code you will write will work even if it falls on another line, and you don’t necessarily need to have the nested code to be intended by a certain tab size.The code indentation in lua is more about making the code look much better and more readable. If your entire code is on one line or worse, if it is like multiple lines then I am afraid that your code isn’t very readable.While we can use the code editor’s indentation packages to do the indentation ...
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