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loop.go
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loop.go
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package main
import (
"bufio"
"fmt"
"io"
"os"
"strconv"
"strings"
)
//将整数转为二进制
func convertToBin(n int) string {
result := ""
if n == 0 {
return "0"
}
for ; n > 0; n /= 2 {
lsb := n % 2
result = strconv.Itoa(lsb) + result
}
return result
}
//循环方式读取文件
//相当于while
func readFile(filename string) {
file, err := os.Open(filename)
if err != nil {
panic(err)
} else {
scanner := bufio.NewScanner(file)
for scanner.Scan() {
fmt.Println(scanner.Text())
}
}
}
//没有循环条件
//无限循环
func forver() {
for {
fmt.Println("abc")
}
}
func main() {
fmt.Println(
convertToBin(5), //101
convertToBin(13), //1011-->1101
convertToBin(13132131231),
convertToBin(0),
)
readFile("abc.txt")
//表示支持换行的字符串
s := `abc"d"
kkkk
10100100101
pp`
printFileContents(strings.NewReader(s))
//forver()
}
func printFileContents(reader io.Reader) {
scanner := bufio.NewScanner(reader)
for scanner.Scan() {
fmt.Println(scanner.Text())
}
}