Trending February 2024 # Golang Program To Print The Home Directory Of The Current User # Suggested March 2024 # Top 6 Popular

You are reading the article Golang Program To Print The Home Directory Of The Current User updated in February 2024 on the website Flu.edu.vn. We hope that the information we have shared is helpful to you. If you find the content interesting and meaningful, please share it with your friends and continue to follow and support us for the latest updates. Suggested March 2024 Golang Program To Print The Home Directory Of The Current User

The Go programming language provides various methods to obtain the home directory of the current user. This information can be useful in many applications, such as file management, system configuration, etc. In this article, we will discuss different methods to get the home directory in Go along with syntax and examples.

Method 1: Using os.UserHomeDir()

The os.UserHomeDir() function is part of the Go standard library and is the simplest and most efficient method to get the home directory of the current user. Here is an example that demonstrates the usage of os.UserHomeDir()

Syntax func UserHomeDir() (string, error)

The UserHomeDir() function is present in os package. This function returns the home directory of the current user as a string and an error in case the home directory cannot be obtained.

Algorithm

Step 1 − First, we need to import the os and fmt packages.

Step 2 − Then, start the main() function. Inside the main() use os.UserHomeDir() function and store the result in a variable.

Step 3 − Check if the function returns an error.

Step 4 − If an error is returned, print the error on the screen.

Step 5 − If no error is returned, print the home directory.

Example

In this example, we first call os.UserHomeDir() and store the result in the home variable. If the function returns an error, we print it and return from the function. If everything goes well, we print the home directory.

package main import ( "fmt" "os" ) func main() { Home, _ := os.UserHomeDir() fmt.Println("Home Directory:", Home) } Output Home Directory: /home/cg/root/11942 Method 2: Using os.Getenv() function

In this method, we will use another method to get the home directory of the current user by using the os.Getenv() function. This function returns the value of an environment variable as a string.

Syntax func Getenv(key string) string

The Getenv() method is used to get the path of the current directory of the user in string format. the function accepts the key as an argument and returns the path to the Output.

In this case, we need to pass the key “HOME” to get the home directory of the current user. Here is an example that demonstrates the usage of os.Getenv() −

Algorithm

Step 1 − First, we need to import the os, runtime and fmt package.

Step 2 − Then create a function named userHomeDir the function returns the home path of the user in string format.

Step 3 − First of all the function will check whether the environment used is windows or linux based on the environment the user will return the user profile.

Step 4 − Then, start the main() function. Inside the main() call the UserHomeDir() function and store the result in a variable.

Step 5 − Print the value of the variable on the screen by using fmt.Println() function.

Example

In this example, we are going to use os.Getenv() function of golang to get the home directory of the current user.

package main import ( "fmt" "os" "runtime" ) func userHomeDir() string { if chúng tôi == "windows" { home := os.Getenv("HOMEDRIVE") + os.Getenv("HOMEPATH") if home == "" { home = os.Getenv("USERPROFILE") } return home } else if chúng tôi == "linux" { home := os.Getenv("XDG_CONFIG_HOME") if home != "" { return home } } return os.Getenv("HOME") } func main() { fmt.Println("Home Directory is:", userHomeDir()) } Output Home Directory is: /home/cg/root/90543 Method 3: Using os/user Package

The os/user package provides a more flexible method to get information about the current user, including the home directory. The user.Current() function returns the user information of the current user.

Syntax func Current() (*User, error)

This function returns a *User structure that contains information about the current user, including the home directory.

Algorithm

Step 1 − Import the os/user package

Step 2 − Call the user.Current() function and store the result in a variable

Step 3 − Check if the function returns an error

Step 4 − If an error is returned, print it and return from the function

Step 5 − If no error is returned, access the HomeDir field of the structure and store it in a variable

Step 6 − Print the value of the variable

Example

In this example, we first call user.Current() and store the result in the currentUser variable. If the function returns an error, we print it and return from the function. If everything goes well, we access the HomeDir field of the currentUser structure to get the home directory and print it.

package main import ( "fmt" "os/user" ) func main() { CurrentUser, err :=user.Current() if err !=nil { fmt.Println("Error:", err) return } fmt.Println("Home Directory:", CurrentUser.HomeDir) } Output Home Directory: /home/webmaster Conclusion

In this article, we discussed three methods to get the home directory of the current user in Go programming language. The os.UserHomeDir() function is the simplest and most efficient method, while the os.Getenv() function provides a more generic method that can be used to get other environment variables as well. The os/user package provides a more flexible method that provides more information about the current user, including the home directory. You can choose the method that suits your requirements best.

You're reading Golang Program To Print The Home Directory Of The Current User

Golang Program To Remove A Specified Directory

Golang provides several methods to remove a specified directory, including using the os and filepath packages. Removing a directory is a critical operation, and caution should be exercised when performing this task. This article will discuss the different methods to remove a directory in Golang, along with the syntax and algorithm for each method.

Method 1: Using The os Package

The os package in Golang provides several functions to perform operating system-related operations, including removing a directory. The Remove function of the os package is used to remove a directory.

Syntax Remove(dirName)

The Remove() function is present in os package and is used to remove a particular directory. The function accepts the name of directory to be removed as argument and removes that particular directory from the list.

Algorithm

Import the os package in your Go program.

Call the os.Remove function, passing the path to the directory as an argument.

The Remove function removes the directory but does not remove any subdirectories or files within the directory.

Example

In this example, we first import the fmt and os packages. We then specify the name of the directory to be removed in the dirName variable. Next, we call the os.Remove function and pass the dirName variable as an argument. If the directory is successfully removed, the program will Output “Directory removed successfully”. If there is an error, the error message will be displayed.

package main import ( "fmt" "os" ) func main() { dirName := "new" err := os.Remove(dirName) if err != nil { fmt.Println(err) } else { fmt.Println("Directory", dirName, "removed successfully") } } Output remove new: no such file or directory Method 2: Using Filepath Package

The filepath package in Golang provides several functions to perform operations related to file paths, including removing a directory. In this methodwe will use the RemoveAll function of the filepath package to remove a directory and all its contents.

Syntax filepath.RemoveAll(dirName)

The RemoveAll() function is present in filepath package and is used to remove a directory along with its contents. The function accepts the name of directory to be removed as an argument and removes it with all its contents.

Algorithm

Import the filepath package in your Go program.

Call the os.RemoveAll() function, passing the path to the directory as an argument.

The RemoveAll function removes the directory and all its contents, including subdirectories and files.

Example

In this example, we first import the fmt and os packages. We then specify the name of the directory to be removed in the dirName variable. Next, we call the os.RemoveAll function and pass the dirName variable as an argument. If the directory is successfully removed, the program will Output “Directory removed successfully”. If there is an error, the error message will be displayed.

package main import ( "fmt" "os" ) func main() { dirName := "newdir" err := os.RemoveAll(dirName) if err != nil { fmt.Println(err) } else { fmt.Println("Directory", dirName, "removed successfully") } } Output Directory newdir removed successfully Method 3: Using the Syscall Package

The syscall package in Golang provides a low-level interface to the operating system, including the ability to remove a directory. The Rmdir function of the syscall package is used to remove a directory.

Syntax syscall.Rmdir(dirName)

The Rmdir() function is present in syscall package and is used to remove a given directory from the list of files. The function accepts the name of directory to be removed as argument and removes it.

Algorithm

First, we need to import the fmt and syscall packages.

Then start the main() function. Inside the main() Specify the name of the directory to be removed and store it in a variable.

Call the Rmdir() function present in syscall package and pass the name of the directory as an argument to it.

Check for errors and print the appropriate message after the given directory is removed.

Example

In this example, we first import the fmt and syscall packages. We then specify the name of the directory to be removed in the dirName variable. Next, we call the syscall.Rmdir function and pass the dirName variable as an argument. If the directory is successfully removed, the program will Output “Directory removed successfully”. If there is an error, the error message will be displayed.

package main import ( "fmt" "syscall" ) func main() { dirName := "dir" err := syscall.Rmdir(dirName) if err != nil { fmt.Println(err) } else { fmt.Println("Directory", dirName, "removed successfully") } } Output no such file or directory Conclusion

In Conclusion, Golang provides two methods to remove a specified directory, including using the os package and filepath package. The choice of method depends on the requirements of the specific task. The os package provides the Remove function, which removes a directory, while the filepath package provides the RemoveAll function, which removes a directory and all its contents. Removing a directory is a critical operation, and it’s important to use caution when performing this task.

Golang Program To Print Mirror Upper Star Triangle Pattern

In this tutorial, we will learn how to print downward triangle pattern using Go programming language.

Syntax for initialization; condition; update { statement(s) }

In the code, we use the for loop to repeat a block of code until the specified condition is met.

Example: Golang Program to Print Download Triangle Star Pattern Using One Single Function Algorithm

Step 1 − Import the package fmt.

Step 2 − Start the function main ().

Step 3 − Declare and initialize the variables.

Step 4 − Use of for loop with condition and incrementor.

Step 5 − Start the function main ().

Step 6 − Calling the function upper () to print mirror upper star triangle pattern.

Step 7 − Print the result using fmt.Println ().

Example

package

main

import

“fmt”

func

upper

(

row

int

)

bool

{

var

i

int

var

j

int

row

=

6

fmt

.

Scanln

(

&

row

)

for

i

=

0

;

i

<

row

;

i

++

{

fmt

.

Print

(

” “

)

}

for

j

=

0

;

j

<=

i

;

j

++

{

fmt

.

Print

(

“* “

)

}

fmt

.

Println

(

)

}

for

i

=

1

;

i

<=

row

;

i

++

{

for

j

=

1

;

j

<

i

;

j

++

{

fmt

.

Print

(

” “

)

}

for

j

=

i

;

j

<=

row

;

j

++

{

fmt

.

Print

(

“*”

+

” “

)

}

fmt

.

Println

(

)

}

return

true

}

func

main

(

)

{

fmt

.

Println

(

“GOLANG PROGRAM TO PRINT MIRROR UPPER STAR TRIANGLE PATTERN”

)

fmt

.

Print

(

upper

(

6

)

)

}

Output GOLANG PROGRAM TO PRINT MIRROR UPPER STAR TRIANGLE PATTERN * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * true Description Of The Code

In the above program, we first declare the package main.

We imported the fmt package that includes the files of package fmt.

Next, we create the function upper () to print the pattern.

Declare the three integer variables i, j and row. Initialize the row variable to an integer value you want for the number of rows of the mirror upper star triangle pattern.

Using for loop − The condition is given inside an if statement and stop execution is mentioned once the condition is right.

Start the function main ().

Next, we call the function upper () to print the pattern.

And last printing the result on the screen using fmt.Println ().

Conclusion

We have successfully compiled and executed the Golang program code to print the mirror upper star triangle pattern in the above example.

How To Print The Ascii Values In Golang?

In this tutorial, we are going to learn how to find and print the ASCII value of any character or symbol in Golang. The ASCII stands for American Standard Code for Information Exchange which is a way to represent the characters, and symbols in numeric form.

Printing the ASCII value using specifier Algorithm

STEP 1 − Declaring the variable of string type

STEP 2 − Initializing the variable.

STEP 3 − Running the for loop which is printing the ASCII value for each element in the string.

Example 1

In this example, we are going to print the ASCII value of the character using the %d specifier.

import

(

“fmt”

)

func

main

(

)

{

var

introduction string

introduction

=

“TutorialsPoint”

fmt

.

Println

(

“ASCII of “

,

introduction

,

“is”

)

for

i

:

=

0

;

i

<

len

(

introduction

)

;

i

++

{

fmt

.

Printf

(

“The ASCII value of %c is %d n”

,

introduction

[

i

]

,

introduction

[

i

]

)

}

fmt

.

Println

(

“(Printing the ASCII value using specifier)”

)

}

Output ASCII of TutorialsPoint is The ASCII value of T is 84 The ASCII value of u is 117 The ASCII value of t is 116 The ASCII value of o is 111 The ASCII value of r is 114 The ASCII value of i is 105 The ASCII value of a is 97 The ASCII value of l is 108 The ASCII value of s is 115 The ASCII value of P is 80 The ASCII value of o is 111 The ASCII value of i is 105 The ASCII value of n is 110 The ASCII value of t is 116 (Printing the ASCII value using specifier) Description of code:

var introduction string − In this line, we are declaring the variable introduction of string type in which we will store the input from the user.

for i := 0; i < len(introduction); i++ {} − Running a for loop over the complete string from 0 till length of the string.

fmt.Printf(“The ASCII value of %c is %d n”, introduction[i], introduction[i]) − Printing the ASCII value of each element in the string using the %d specifier

Printing the ASCII value using Tyoe Casting Algorithm

STEP 1 − Declaring the variable of string type.

STEP 2 − Taking the input from the user by creating an object for the reader

STEP 3 − Running the for loop which is printing the ASCII value for each element in the string.

Example 2

In this example, we are going to print the ASCII value of the character using type casting.

package

main

import

(

"bufio"

"fmt"

"os"

"strings"

)

func

main

(

)

{

var

dateOfBirth string

fmt

.

Println

(

"Can you please write down your Date of Birth?"

)

inputReader

:

=

bufio

.

NewReader

(

os

.

Stdin

)

dateOfBirth

,

_

=

inputReader

.

ReadString

(

'n'

)

dateOfBirth

=

strings

.

TrimSuffix

(

dateOfBirth

,

"n"

)

for

i

:

=

0

;

i

<

len

(

dateOfBirth

)

;

i

++

{

fmt

.

Println

(

"The ASCII value of"

,

string

(

dateOfBirth

[

i

]

)

,

"is"

,

int

(

dateOfBirth

[

i

]

)

)

}

fmt

.

Println

(

"(Printing the ASCII value using Type Casting)"

)

}

Output Can you please write down your Date of Birth? 27/05/1993 The ASCII value of 2 is 50 The ASCII value of 7 is 55 The ASCII value of / is 47 The ASCII value of 0 is 48 The ASCII value of 5 is 53 The ASCII value of / is 47 The ASCII value of 1 is 49 The ASCII value of 9 is 57 The ASCII value of 9 is 57The ASCII value of 3 is 51 (Printing the ASCII value using Type Casting) Description of code:

var introduction string − In this line, we are declaring the variable introduction of string type in which we will store the input from the user.

inputReader := bufio.NewReader(os.Stdin)

introduction, _ = inputReader.ReadString(‘n’) − Creating a reader object and taking input from the user.

for i := 0; i < len(introduction); i++ {} − Running a for loop over the complete string from 0 till length of the string.

fmt.Println(“The ASCII value of”, string(dateOfBirth[i]), “is”, int(dateOfBirth[i])) − Printing the ASCII value of each element in the string using the typecasting concept like this int(dateOfBirth[i]).

Conclusion

These are the two ways to print the ASCII values in Golang. To learn more about Go you can explore these tutorials.

Swift Program To Print Left Triangle Pattern Of Numbers

This tutorial will discuss how to write swift program to print left triangle pattern of numbers.

Numeric pattern is a sequence of numbers which is used to develop different patterns or shapes like pyramid, rectangle, cross, etc. These numeric patterns are generally used to understand or practice the program flow controls, also they are good for logical thinking.

To create a left triangle pattern of numbers, we can use any of the following methods −

Using nested for loop

Using init() Function

Using stride Function

Below is a demonstration of the same −

Input

Suppose our given input is −

Num = 10

Output

The desired output would be −

1 1 2 1 2 3 1 2 3 4 1 2 3 4 5 1 2 3 4 5 6 1 2 3 4 5 6 7 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 10 Method 1 – Using Nested For Loop

We can create a left triangle star pattern or any other pattern using nested for loops.

Example

The following program shows how to print a left triangle pattern of numbers using nested for loop.

import

Glibc

let

num

=

9

for

x

in

1.

.

.

num

{

for

y

in

1.

.

.

x

{

print

(

y

,

terminator

:

” “

)

}

print

(

” “

)

}

Output 1 1 2 1 2 3 1 2 3 4 1 2 3 4 5 1 2 3 4 5 6 1 2 3 4 5 6 7 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 9

Here, in the above code, we uses nested for loops to print left triangle pattern of numbers. The outer most for loop(starts from 1 to 9) is use to handle the total number of rows are going to print and each row is start with new line. Now the nested for loop(starts from 1 to x) is used to print numbers from 1 to 9 in triangle pattern or we can say is used to handle the total number of columns in the pattern.

Method 2 – Using init() Function

Swift provide an in-built function named String.init(). Using this function, we can able to create any pattern. String.init() function create a string in which the given character is repeated the specified number of times.

Syntax

Following is the syntax −

String.init(repeating:Character, count: Int)

Here, repeating represent the character which this method repeats and count represent the total number of time the given character repeat in the resultant string.

Example

The following program shows how to print left triangle pattern of numbers using string.init() function.

import

Glibc

let

num

=

4

for

i

in

1.

.

.

num

{

print

(

String

.

init

(

repeating

:

“123”

,

count

:

i

)

)

}

Output 123 123123 123123123 123123123123

Here in the above code, we create a left triangle pattern of numeric string = “123” of height 4 using String.init() function. Here we uses for loop(starting from 1 to num) which is used to print each row. In this loop, we uses String.init() function. This function prints “123” according to the count value(that is i) −

print(String.init(repeating:"123", count:i))

So the working of the above code is −

num = 4

In 1st iteration: i = 1

print(String.init(repeating: "123”, count: 1))

So it print one times “123”

print(String.init(repeating: "123”, count: 2))

So it print two times “123”

So on till 4th iteration and print left triangle pattern of numbers.

Method 3 – Using stride Function

Swift provide an in-built function named stride(). The stride() function is used to move from one value to another with increment or decrement. Or we can say stride() function return a sequence from the starting value but not include end value and each value in the given sequence is steps by the given amount.

Syntax

Following is the syntax −

stride(from:startValue, to: endValue, by:count)

Here,

from − Represent the starting value to used for the given sequence.

to − Represent the end value to limit the given sequence

by − Represent the amount to step by with each iteration, here positive value represent upward iteration or increment and negative value represent the downward iteration or decrement.

Example

The following program shows how to print left triangle pattern of numbers using stride() function.

import

Glibc

let

num

=

13

for

i

in

1.

.

.

num

{

for

j

in

stride

(

from

:

1

,

to

:

i

,

by

:

1

)

{

print

(

j

,

terminator

:

” “

)

}

print

(

“”

)

}

Output 1 1 2 1 2 3 1 2 3 4 1 2 3 4 5 1 2 3 4 5 6 1 2 3 4 5 6 7 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 11 1 2 3 4 5 6 7 8 9 10 11 12

Here in the above code, we uses nested for loops along with stride() function. The outermost for loop(start from 1 to num) is used to handle the total number of rows are going to print and each row starts with a new line. And the nested for loop is used to print left triangle pattern of numbers using stride() function −

for _ in stride(from: 1, to: i, by: 1) { print("*", terminator:" ") }

Here the iteration starts from 1 to i and each iteration is increased by one and print numbers from 1 to 12 in left triangle pattern.

Golang Program To Get Key Based On Value From The Hash Collection

In golang, we can use hashmap to perform various operations like deleting, updating, and storing the values in the hash collection. In this article, we are going to understand get key based on a value from the hash collection using two different examples. In the first example, we will use an external function and iterate the map to get the key from the value, in the second example we will use a reverse map to get the key from the desired value.

Algorithm

Create a package main and declare fmt(format package) in the program where main produces executable codes and fmt helps in formatting input and output.

Create an external function named get_value_from_key with two inputs the hashmap and the value whose key is to be obtained.

Iterate the hashmap and on every iteration check whether the value is equal to the val of the hashmap.

If its true return the key whose value is checked but if the value is not present in the hashmap return empty string.

In the main function, a hashmap is created using map literal where the keys are of type string and values are of type int.

Call the external function from the main with two arguments and obtain the returned value in key.

Call the function again with a value that is not present in the hashmap and an empty string will be returned in this case.

Print the key on the console using fmt.Println() function where ln means new line.

Example 1

In this example, we will create an external function with two parameters namely the hashmap and the value whose key is to be printed.

package main import "fmt" func get_value_from_key(hash map[string]int, value int) string { for key, val := range hash { if val == value { return key } } return "" } func main() { hashmap := map[string]int{ "one": 10, "two": 20, "three": 30, } key := get_value_from_key(hashmap, 20) fmt.Println("The key to corresponding value is:") fmt.Println(key) key = get_value_from_key(hashmap, 40) fmt.Println(key) } Output The key to corresponding value is: two Example 2

In this illustration, we will create a map in which we will assign the keys to the values in reverse manner then we will return the respective key to the value given as input. The output will be the key to the respective value. Let’s explore it through the code and the algorithm.

package main import "fmt" func get_key_from_value(hash map[string]int, value int) string { reverseHash := make(map[int]string) for key, val := range hash { reverseHash[val] = key } return reverseHash[value] } func main() { hashmap := map[string]int{ "one": 10, "two": 20, "three": 30, } key := get_key_from_value(hashmap, 20) fmt.Println("The key of the above value is: ") fmt.Println(key) key = get_key_from_value(hashmap, 40) fmt.Println(key) } Output The key of the above value is: two Conclusion

We executed the program of getting a key based on a value from hash collection using two methods. In the first example we used an external function and iteration to get the required key and in the second example we used a reverse map technique to get the desired output.

Update the detailed information about Golang Program To Print The Home Directory Of The Current User on the Flu.edu.vn website. We hope the article's content will meet your needs, and we will regularly update the information to provide you with the fastest and most accurate information. Have a great day!