Go Systems Programming

The wc.go code!

After this little introduction, it is time to see the Go code of wc.go, which will be presented in five parts. The first part is the expected preamble:

package main 
 
import ( 
   "bufio" 
   "flag" 
   "fmt" 
   "io" 
   "os" 
   "regexp" 
) 

The second part is the implementation of the countLines() function, which includes the core functionality of the program. Note that the name countLines() may have been a poor choice as countLines() also counts the words and the characters of a file:

func countLines(filename string) (int, int, int) { 
   var err error 
   var numberOfLines int 
   var numberOfCharacters int 
   var numberOfWords int 
   numberOfLines = 0 numberOfCharacters = 0 numberOfWords = 0 f, err := os.Open(filename) if err != nil { fmt.Printf("error opening ...