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。