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Golang program to create a simple buffer reader

Here, we are going to learn how to create a simple buffer reader in Golang (Go Language)?
Submitted by Nidhi, on April 08, 2021 [Last updated : March 04, 2023]

How to create a simple buffer reader in Golang?

Problem Solution:

In this program, we will open a file and create a buffer-reader using a file pointer and then read data from a file using Peek() function.

Program/Source Code:

The source code to create a simple buffer reader is given below. The given program is compiled and executed on the ubuntu 18.04 operating system successfully.

Golang code to create a simple buffer reader

// Golang program to create a 
// simple buffer reader

package main

import "fmt"
import "os"
import "bufio"


func main() {
    filePtr, err := os.Open("Demo.txt")
    if err != nil {
        fmt.Println(err)
    }
    
    bufferedReader := bufio.NewReader(filePtr)

    data := make([]byte, 11)
    data, err = bufferedReader.Peek(12)
    if err != nil {
        fmt.Println(err)
    }
    fmt.Printf("Data : %s\n", data)

    filePtr.Close()
}

Output:

Data : Hello World

Explanation:

In the above program, we declare the package main. The main package is used to tell the Go language compiler that the package must be compiled and produced the executable file. Here, we imported the fmt, os packages then we can use a function related to the fmt and os package.

Here, we also imported the bufio package to use buffer writer to write data into a file.

In the main() function, we opened the "Demo.txt" file and then create a buffer-reader using NewReader() function and read 12 bytes from the file using Peek() function, and print the result on the console screen.

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