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courserra-read-file.go
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courserra-read-file.go
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package main
import (
"bufio"
"fmt"
"log"
"os"
"strings"
)
type Name struct {
fname string
lname string
}
func first50Char(s string) string {
runes := []rune(s)
return string(runes[0:50])
}
func main() {
var fileName string
nameSlice := make([]Name, 0)
var nameObj Name
fmt.Print("Enter filename: ")
fmt.Scan(&fileName)
file, err := os.Open(fileName)
if err != nil {
log.Fatal(err)
}
defer file.Close()
filescan := bufio.NewScanner(file)
for filescan.Scan() {
s := strings.Split(filescan.Text(), " ")
if len(s[0]) > 50 {
s[0] = first50Char(s[0])
}
if len(s[1]) > 50 {
s[1] = first50Char(s[1])
}
nameObj.fname, nameObj.lname = s[0], s[1]
nameSlice = append(nameSlice, nameObj)
}
for _, v := range nameSlice {
fmt.Println(v.fname, v.lname)
}
if err := filescan.Err(); err != nil {
log.Fatal(err)
}
}
/*
package main
import (
"bufio"
"fmt"
"os"
"strings"
)
type Name struct {
firstName, lastName string
}
func main() {
Data := make([]Name, 0, 100000)
fmt.Println("Enter input file path: ")
var filePath string
_, _ = fmt.Scan(&filePath)
file, err := os.Open(filePath)
if err != nil {
fmt.Println("File opening failed! Make sure correct path format!")
os.Exit(1)
}
scanner := bufio.NewScanner(file)
for scanner.Scan() {
name := strings.Split(strings.TrimSpace(scanner.Text()), " ")
Data = append(Data, Name{name[0], name[1]})
}
fmt.Println("File read successfully...")
for _, name := range Data {
fmt.Println(name.firstName, name.lastName)
}
}
*/