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Golang fmt.Fscan()用法及代碼示例

在Go語言中,fmt軟件包使用與C的printf()和scanf()函數相似的函數來實現格式化的I /O。 Go語言中的fmt.Fscan()函數掃描指定的文本,從r中讀取,然後將連續的以空格分隔的值存儲到連續的參數中。在這裏,換行符被視為空格。此外,該函數在fmt包下定義。在這裏,您需要導入“fmt”包才能使用這些函數。

用法:

func Fscan(r io.Reader, a ...interface{}) (n int, err error)

參數:此函數接受兩個參數,如下所示:

  • r io.Reader:此參數包含掃描的指定文本。
  • a …interface{}:此參數接收每種類型的指定文本。

返回值:它返回成功掃描的項目數。

範例1:



// Golang program to illustrate the usage of 
// fmt.Fscan() function 
  
// Including the main package 
package main 
  
// Importing fmt, io and strings 
import ( 
    "fmt"
    "os"
    "strings"
) 
  
// Calling main 
func main() { 
  
        // Declaring some type of variables 
    var ( 
        i int
        b bool
        s string 
    ) 
      
    // Calling the NewReader() function to 
    // specify some type of texts. 
    // variable "r" contains the scanned texts 
    r:= strings.NewReader("10 false GFG") 
      
    // Calling the Fscan() function to receive  
    // the scanned texts 
    n, err:= fmt.Fscan(r, &i, &b, &s) 
      
    // If the above function returns an error then 
    // below statement will be executed 
    if err != nil { 
        fmt.Fprintf(os.Stderr, "Fscanf:%v\n", err) 
    } 
      
    // Printing each type of scanned texts 
    fmt.Println(i, b, s) 
      
    // It returns the number of items  
    // successfully scanned 
    fmt.Println(n) 
}

輸出:

10 false GFG
3

範例2:

// Golang program to illustrate the usage of 
// fmt.Fscan() function 
  
// Including the main package 
package main 
  
// Importing fmt, io and strings 
import ( 
    "fmt"
    "os"
    "strings"
) 
  
// Calling main 
func main() { 
  
        // Declaring some type of variables 
    var ( 
        i int
        b bool
        s string 
        f float32 
    ) 
      
    // Calling the NewReader() function to 
    // specify some type of texts. 
    // variable "r" contains the scanned texts 
    r:= strings.NewReader("46 true 3.4 GeeksforGeeks") 
      
    // Calling the Fscan() function to receive  
    // the scanned texts 
    n, err:= fmt.Fscan(r, &i, &b, &f, &s) 
      
    // If the above function returns an error then 
    // below statement will be executed 
    if err != nil { 
        fmt.Fprintf(os.Stderr, "Fscanf:%v\n", err) 
    } 
      
    // Printing each type of scanned texts 
    fmt.Println(i, b, f, s) 
      
    // It returns the number of items  
    // successfully scanned 
    fmt.Println(n) 
}

輸出:

46 true 3.4 GeeksforGeeks
4



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注:本文由純淨天空篩選整理自Kanchan_Ray大神的英文原創作品 fmt.Fscan() Function in Golang With Examples。非經特殊聲明,原始代碼版權歸原作者所有,本譯文未經允許或授權,請勿轉載或複製。