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Golang fmt.Fprintf()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。根據格式說明符使用Go語言格式的fmt.Fprintf()函數並將其寫入w。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 Fprintf(w io.Writer, format string, a ...interface{}) (n int, err error)

參數:此函數接受三個參數,如下所示:

  • 作家這是指定的標準輸入或輸出。
  • format string:它包含一些字符串,包括動詞。
  • a …interface{}:這是代碼中使用的指定常量變量。

返回值:它返回已寫入的字節數以及遇到的任何寫入錯誤。

範例1:



// Golang program to illustrate the usage of 
// fmt.Fprint() function 
  
// Including the main package 
package main 
  
// Importing fmt and os 
import ( 
    "fmt"
    "os"
) 
  
// Calling main 
func main() { 
  
    // Declaring some const variables 
    const name, dept = "GeeksforGeeks", "CS"
  
    // Calling Fprintf() function which returns 
    // "n" as the number of bytes written and  
    // "err" as any error ancountered 
    n, err:= fmt.Fprintf(os.Stdout, "%s is a %s portal.\n", 
                                                name, dept) 
  
    // Printing the number of bytes written 
    fmt.Print(n, " bytes written.\n") 
  
    // Printing if any error encountered 
    fmt.Print(err) 
  
}

輸出:

GeeksforGeeks is a CS portal.
30 bytes written.
<nil>

範例2:

// Golang program to illustrate the usage of 
// fmt.Fprintf() function 
  
// Including the main package 
package main 
  
// Importing fmt and os 
import ( 
    "fmt"
    "os"
) 
  
// Calling main 
func main() { 
  
    // Declaring some const variables 
    const num1, num2, num3 = 5, 10, 15 
  
    // Calling Fprintf() function which returns 
    // "n" as the number of bytes written and  
    // "err" as any error encountered 
    n, err:= fmt.Fprintf(os.Stdout, "%d + %d = %d.\n", 
                                      num1, num2, num3) 
  
    // Printing the number of bytes written 
    fmt.Print(n, " bytes written.\n") 
  
    // Printing if any error encountered 
    fmt.Print(err) 
  
}

輸出:

5 + 10 = 15.
13 bytes written.
<nil>



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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.Fprintf() 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。