53 lines
902 B
Go
53 lines
902 B
Go
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package main
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import (
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"bufio"
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"fmt"
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"log"
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"os"
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"strconv"
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)
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func OpenFile(fileName string) (*os.File, error) {
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fmt.Println("Opening", fileName)
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return os.Open(fileName)
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}
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func CloseFile(file *os.File) {
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fmt.Println("Closing file")
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file.Close()
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}
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func GetFloats(fileName string) ([]float64, error) {
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var numbers []float64
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file, err := OpenFile(fileName)
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if err != nil {
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return nil, err
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}
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defer CloseFile(file)
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scanner := bufio.NewScanner(file)
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for scanner.Scan() {
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number, err := strconv.ParseFloat(scanner.Text(), 64)
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if err != nil {
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return nil, err
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}
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numbers = append(numbers, number)
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}
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if scanner.Err() != nil {
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return nil, scanner.Err()
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}
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return numbers, nil
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}
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func main() {
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numbers, err := GetFloats(os.Args[1])
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if err != nil {
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log.Fatal(err)
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}
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var sum float64 = 0
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for _, number := range numbers {
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sum += number
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}
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fmt.Printf("Sum: %0.2f\n", sum)
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}
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