编程打卡：面向对象程序设计测试

``go
package main
import "bufio"
import "flag"
import "fmt"
import "io"
import "os"
import "strconv"
var infile *string = flag.String("i", "unsorted.dat", "File contains values for sorting")
var outfile *string = flag.String("o", "sorted.dat", "File to receive sorted values")
var algorithm *string = flag.String("a", "qsort", "Sort algorithm")
func readValues(infile string)(values []int, err error) {
file, err := os.Open(infile)
if err != nil {
fmt.Println("Failed to open the input file ", infile)
return
}
defer file.Close()
br := bufio.NewReader(file)
values = make([]int, 0)
for {
line, isPrefix, err1 := br.ReadLine()
if err1 != nil {
if err1 != io.EOF {
err = err1
}
break
}
if isPrefix {
fmt.Println("A too long line, seems unexpected.")
return
}
str := string(line) // 转换字符数组为字符串
value, err1 := strconv.Atoi(str)
if err1 != nil {
err = err1
return
}
values = append(values, value)
}
return
}
func main() {
flag.Parse()
if infile != nil {
fmt.Println("infile =", *infile, "outfile =", *outfile, "algorithm =", algorithm)
}
values, err := readValues(infile)
if err == nil {
fmt.Println("Read values:", values)
} else {
fmt.Println(err)
}
}
func writeValues(values []int, outfile string) error {
file, err := os.Create(outfile)
if err != nil {
fmt.Println("Failed to create the output file ", outfile)
return err
}
defer file.Close()
for _, value := range values {
str := strconv.Itoa(value)
file.WriteString(str + "\n")
}
return nil
}