fmt。Golang 中的 Fprint()函数示例
原文:https://www . geesforgeks . org/fmt-fprint-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。Fprint() 函数在 Go 语言格式中使用其操作数的默认格式并写入 w。这里，当任何字符串未用作参数时，操作数之间会添加空格。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 Fprint(w io.Writer, a ...interface{}) (n int, err error)
参数:该函数接受两个参数，如下图所示:
- w io。 Writer: This is the specified standard input or output.
- A … interface {}: This is used in code containing some strings or constant variables.
返回值:返回写入的字节数和遇到的任何写入错误。
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 Fprint() function which returns
// "n" as the number of bytes written and
// "err" as any error ancountered
n, err := fmt.Fprint(os.Stdout, name, " is a ",
dept, " portal.\n")
// Printing the number of bytes written
fmt.Print(n, " bytes written.\n")
// Printing if any error encountered
fmt.Print(err)
}
输出:
GeeksforGeeks is a CS portal.
30 bytes written.
<nil>
例 2:
// 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 num1, num2, num3 = "a", "b", "c"
// Calling Fprint() function which returns
// "n" as the number of bytes written and
// "err" as any error encountered
n, err := fmt.Fprint(os.Stdout, num1, num2, num3, "\n")
// Printing the number of bytes written
fmt.Print(n, " bytes written.\n")
// Printing if any error encountered
fmt.Print(err)
}
输出:
abc
4 bytes written.
<nil>
在上面的代码中，使用的常量变量是字符串，因此在输出中上面显示的两个字符串之间没有添加空格。
例 3:
// 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 num1, num2, num3 = 5, 15, 15
// Calling Fprint() function which returns
// "n" as the number of bytes written and
// "err" as any error encountered
n, err := fmt.Fprint(os.Stdout, num1, num2, num3, "\n")
// Printing the number of bytes written
fmt.Print(n, " bytes written.\n")
// Printing if any error encountered
fmt.Print(err)
}
输出:
5 15 15
8 bytes written.
<nil>
在上面的代码中，使用的常量变量是数字，因此在上面输出中显示的两个数字之间添加了空格。
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