Adde BufIO

Author: uschramme

BufIO/BufferedIO.go

@@ -0,0 +1,52 @@
+package main
+
+import (
+"bufio"
+"fmt"
+"os"
+)
+
+// Buffered I/O is an efficient way to handle files.
+// It is faster to write a big chunk of data than many small chunks.
+// The bufio-package contains many more useful functions. Explore it!
+
+// Writing a textfile
+func WriteFile(filename string) {
+f, err := os.Create(filename) // creating the textfile
+if err != nil {
+panic(err.Error()) // error handling
+}
+defer f.Close()
+w := bufio.NewWriter(f) // new writer with default size (4096 Bytes)
+var text string
+for i := 0; i < 100; i++ {
+text = fmt.Sprintf("%s %02d\t", "Message", i)
+w.WriteString(text) // write to the buffer
+}
+w.Flush() //write everything to the underlying writer. Never forget this!
+}
+
+// Reading a textfile
+func ReadFile(filename string) {
+f, err := os.Open(filename) // open the textfile
+if err != nil {
+panic(err.Error()) // error handling
+}
+defer f.Close()
+scanner := bufio.NewScanner(f)
+for scanner.Scan() {
+fmt.Println(scanner.Text())
+}
+if err := scanner.Err(); err != nil {
+panic(err.Error()) // error handling
+}
+}
+
+func main() {
+const filename = "Strings.txt"
+WriteFile(filename)
+fmt.Println("100 useless strings written to the file...")
+fmt.Println("Now we will read the file.")
+fmt.Println()
+ReadFile(filename)
+}

README.md

@@ -18,4 +18,8 @@
 
 * **LinkedList**: a singly linked list
 
- *Level: Intermediate*
+ *Level: Intermediate*
+
+* **BufIO**: a simple introduction to buffered i/o
+
+ *Level: Beginner*