update book code

eBook/examples/chapter_12/fileoutput.go

@@ -0,0 +1,28 @@
+package main
+
+import (
+	"os"
+	"bufio"
+	"fmt"
+)
+
+func main () {
+	// var outputWriter *bufio.Writer
+	// var outputFile *os.File
+	// var outputError os.Error
+	// var outputString string
+	outputFile, outputError := os.OpenFile("output.dat", os.O_WRONLY|os.O_CREATE, 0666)
+	if outputError != nil {
+		fmt.Printf("An error occurred with file opening or creation\n")
+		return  
+	}
+	defer outputFile.Close()
+
+	outputWriter := bufio.NewWriter(outputFile)
+	outputString := "hello world!\n"
+	
+	for i:=0; i<10; i++ {
+		outputWriter.WriteString(outputString)
+	}
+	outputWriter.Flush()
+}