Programming Articles - Page 1150 of 3363

Input array is: [2, 4, 1, 6, 5]Sum = 2 + 4 + 1 + 6 + 5 => 18Average = 18/5 => 3.6 ~ 3To calculate the average of numbers in a given list, we can take following steps −Let's take an input list of numbers.Find the sum of numbers using sum() method.The sum method calculates the sum of numbers by iterating the given list.Print the average by dividing the sum with the length of the given list.Example Live Demopackage main import (    "fmt" ) func sum(arr []int) int{    result := 0    for _, i :=range arr ... Read More

To create a class that can perform basic calculator operations, we can take following StepsWe can define a Calculator class with two numbers, a and b.Define a member method to calculate the addition of two numbers.Define a member method to calculate the multiplication of two numbers.Define a member method to calculate the division of two numbers.Define a member method to calculate the subtraction of two numbers.In the main method, declare two variables, a and b.Get an instance of Calculator.Initialize a choice variable, based on which mathematical operations could be performed.Example Live Demopackage main import (    "fmt" ) type Calculator struct ... Read More

To compute the area and perimeter of a circle, we can take following steps −Define a struct with circle properties such as radius.Define a method to calculate the area of the circle.Define a method to calculate the perimeter of the circle.In the main method, take the user's input for circle's radius.Instantiate the circle with the radius.Print the area of the circle.Print the perimeter of the circle.Example Live Demopackage main import (    "fmt"    "math" ) type Circle struct {    radius float64 } func (r *Circle)Area() float64{    return math.Pi * r.radius * r.radius } func (r *Circle)Perimeter() float64{   ... Read More

To find the area of a rectangle using classes, we can take following StepsDefine a struct with rectangle properties such as breadth and length.Define a method to calculate the area of the rectangle.In the main method, instantiate an object of rectangle.Call the struct method, i.e., Area, to calculate the area of the rectangle.Print the area of the rectangle.Example Live Demopackage main import (    "fmt" ) type Rectangle struct {    breadth int    len int } func (r *Rectangle)Area() int{    return r. len * r.breadth } func main(){    rectangle := Rectangle{       breadth: 10,     ... Read More

pre.prettyprint{width:99%!important;} a.demo{top:12px!important; float:right!important;}To read the contents of a file, we can take following steps −We can create a file called test.txt.Clean-up using defer statement.Write the contents of string.Call ReadFile() method to read the file.ReadFile reads the file named by filename and returns the contents.Print the content of the file.Example Live Demopackage main import (    "fmt"    "io/ioutil"    "log"    "os" ) func CreateFile() {    file, err := os.Create("test.txt")    if err != nil {       log.Fatalf("failed creating file: %s", err)    }    defer file.Close()    _, err = file.WriteString("Welcome to Tutorials Point")    if err ... Read More

A function is a group of statements that together perform a task. You can divide up your code into separate functions.Functions help in reducing the code redundancy and at the same time they make the code much more readable and less error prone.In Lua, we declare functions with the help of the function keyword and then, we can invoke(call) the functions just by writing a pair of parentheses followed by the functions name.ExampleConsider the example shown below − Live Demofunction add(a, b) -- declaring the function    return a + b end result = add(1, 2) -- calling the function print(result) ... Read More

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 More

In order to create a sandbox and to be able to use it we must first understand what a sandbox is and why we need it. A sandbox is term that is used in different fields of computer science, like in case we are talking about the software testing domain, then a sandbox is a testing environment that isolates untested code changes and outright experimentation from the production environment and if we talk about cybersecurity, then a sandbox is an environment that is an isolated virtual machine in which potentially unsafe software code can execute.Sandboxing is basically all about isolating ... Read More

Lua does the implicit conversion or also known as coercion when it notices that you are trying to use a number but wrote a string, then it automatically converts the string into an int, and it is quite useful.Let’s consider a simple example where I will declare a string variable, and then I will try to do an arithmetic operation on it, then once the Lua compiler infers that we are trying to use the string as an int, it will automatically convert it into an int.ExampleConsider the example shown below − Live Demostr = "10" print(type(str)) num = 2 * ... Read More

A regular expression is a special text string that is used to describe a search pattern.PCRE (Perl Compatible Regular Expressions) is a C library implementing regex. It was written in 1997 when Perl was the de-facto choice for complex text processing tasks. The syntax for patterns used in PCRE closely resembles Perl. If you want to learn about PERL and its use cases, you should visit this link.Now, let's take an example to see how to convert a PCRE into Lua and then print it.ExampleConsider the code shown below −"\002\003\004\005\006\007\008\009\010\011\012\”The above string acts as a PCRE and we will convert ... Read More