fmt。Fscanln()函数在 Golang 中的应用示例
原文:https://www . geesforgeks . org/fmt-fscanln-function-in-golang-with-examples/
在 Go 语言中, fmt 包实现了格式化的输入输出,其功能类似于 C 的 printf()和 scanf()函数。 fmt。Go 语言中的 Fscanln() 函数扫描指定的文本,从 r 中读取,然后将连续的空格分隔值存储到连续的参数中。该函数在换行符处停止扫描,在最后一项之后,必须有一个换行符或 EOF。此外,该功能在 fmt 包中定义。在这里,您需要导入“fmt”包才能使用这些功能。
语法:
func Fscanln(r io.Reader, a ...interface{}) (n int, err error)
参数:该函数接受两个参数,如下图所示:
- r io。阅读器:该参数包含扫描的指定文本。
- a…接口{}: 这些参数接受每个指定的元素。
返回:返回扫描成功的项目数。
例 1:
// Golang program to illustrate the usage of
// fmt.Fscanln() function
// Including the main package
package main
// Importing fmt, io and strings
import (
"fmt"
"io"
"strings"
)
// Calling main
func main() {
// Declaring list of strings,
// integers and float value
s := `gfg 9`
// Calling NewReader() function for
// reading each elements of the list
// and then it place it into "r"
r := strings.NewReader(s)
// Declaring different types of variables
var a string
var b int
for {
// Calling Fscanln() function
n, err := fmt.Fscanln(r, &a, &b)
// Checking returned error is
// end of the line (EOF) or not
if err == io.EOF {
break
}
// Checking if there is any error
if err != nil {
panic(err)
}
// Printing the number of items successfully
// scanned and each elements too
fmt.Printf("%d: %s, %d", n, a, b)
}
}
输出:
2: gfg, 9
例 2:
// Golang program to illustrate the usage of
// fmt.Fscanln() function
// Including the main package
package main
// Importing fmt, io and strings
import (
"fmt"
"io"
"strings"
)
// Calling main
func main() {
// Declaring list of strings,
// integers and float value
s := `gfg 9 true 5.78`
// Calling NewReader() function for
// reading each elements of the list
// and then it place it into "r"
r := strings.NewReader(s)
// Declaring different types of variables
var a string
var b int
var c bool
var d float32
for {
// Calling Fscanln() function
n, err := fmt.Fscanln(r, &a, &b, &c, &d)
// Checking returned error is
// end of the line (EOF) or not
if err == io.EOF {
break
}
// Checking if there is any error
if err != nil {
panic(err)
}
// Printing the number of items successfully
// scanned and each elements too
fmt.Printf("%d: %s, %d, %t, %g", n, a, b, c, d)
}
}
输出:
4: gfg, 9, true, 5.78
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