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Go Programming Articles
Found 852 articles
Difference between Goroutine and Thread in Golang.
Goroutines and threads are both mechanisms for concurrent execution, but they work at different levels. Goroutines are lightweight, user-space concurrency primitives managed by the Go runtime, while threads are OS-level constructs managed by the operating system kernel. Goroutine A goroutine is a function or method that executes independently and concurrently with other goroutines. Every concurrent activity in Go is typically implemented as a goroutine. Goroutines start with just a few kilobytes of stack space (which grows dynamically) and are multiplexed onto a small number of OS threads by the Go runtime scheduler. Example The following program launches two goroutines that ...
Read MoreGolang Program to Read the Contents of a File
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.Examplepackage 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 MoreGolang Program to Find the Area of a Rectangle Using Classes
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.Examplepackage 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 MoreGolang Program to Create a Class and Compute the Area and Perimeter of a Circle
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.Examplepackage 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{ return ...
Read MoreGolang Program to create a Class that can perform basic Calculator Operations
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.Examplepackage main import ( "fmt" ) type Calculator struct { ...
Read MoreGolang Program to Calculate the Average of Numbers in a Given List
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.Examplepackage main import ( "fmt" ) func sum(arr []int) int{ result := 0 for _, i :=range arr { ...
Read MoreGolang Program to Read a Number (n) and Compute (n+nn+nnn)
Let's read a number, n=5Then, nn=55 and then nnn=555res = 5 + 55 + 555 => 615To read a number (n) and compute (n+nn+nnn), we can take the followingStepsDefine a variable, n.Print a statement to get the number, n.Take user input for variable, n.Make an expression for (n + nn + nnn).Convert the expression into numbers.Compute the sum of the expression.Examplepackage main import ( "fmt" "strconv" ) func main(){ var n int fmt.Print("Enter value of n: ") fmt.Scanf("%d", &n) t1 := fmt.Sprintf("%d", n) t2 := fmt.Sprintf("+%d%d", n, n) t3 := fmt.Sprintf("+%d%d%d", n, ...
Read MoreGolang Program to read the marks of subjects and display the Grade
Let's enter the marks: 89 56 90 67 99Sum of the marks is: 89+56+90+67+99 => 401Avg. = 401/5 = 80.1The steps are as follows:Define variables for 5 subjects.Enter marks for 5 subjects.Find average of the marks to find grade.Use if else block to print grade.Examplepackage main import "fmt" func main(){ var sub1, sub2, sub3, sub4, sub5 int fmt.Println("Enter marks of the five subjects:") fmt.Scanf("%d", &sub1) fmt.Scanf("%d", &sub2) fmt.Scanf("%d", &sub3) fmt.Scanf("%d", &sub4) fmt.Scanf("%d", &sub5) avg:=(sub1+sub2+sub3+sub4+sub5)/5 if avg>=90{ print("Grade: A") }else if avg>=80 && avg=70 && avg=60 && avg
Read MoreGolang Program to Read Two Numbers and Print their Quotient and Remainder
To print the Quotient and Remainder of two numbers, we can use the division operator and the modulo operator.Let's take an Example:a = 15 and b = 2Quotient is 15/2 = 7Remainder is 15 % 2 = 1StepsDefine the variables, a and b.Use print statement for the first number.Use print statement for the second number.Find the division of the numbers, a and b.Find the remainder of the numbers, a and b.Print the calculated division.Print the calculated remainder.Examplepackage main import "fmt" func main(){ var a, b int fmt.Print("Enter first number: ") fmt.Scanf("%d", &a) fmt.Print("Enter second number: ") ...
Read MoreGolang Program to Read Three Digits and Print all Possible Combinations from the Digits
Numbers are: a, b and c => 1, 2, 3Combination of (a, b, c) are: (1, 1, 1), (1, 2, 1), (1, 2, 2), (1, 2, 3), . . ., (3, 3, 3).StepsDefine the variables, a, b and c.Print statement for the first number and scan the number.Print statement for the second number and scan the number.Print statement for the third number and scan the number.Initialize an array with numbers, a, b and c.Iterate the array with iterator i, j and k.Print (i, j, k)th index number of the array.Examplepackage main import "fmt" func main(){ var a, b, c ...
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