在 Go 语言中, fmt包使用类似于 C 的 printf() 和 scanf()函数的函数来实现格式化的 I/O。 Go 语言格式的fmt.Fprint()函数使用其操作数的默认格式并写入 w。这里当任何字符串不用作参数时,在操作数之间添加空格。而且,这个函数是在 fmt 包下定义的。在这里,您需要导入“fmt”包才能使用这些功能。
句法:
func Fprint(w io.Writer, a ...interface{}) (n int, err error)
参数:此函数接受两个参数,如下所示:
- w io.Writer:这是指定的标准输入或输出。
- a …interface{}:它包含代码中使用的一些字符串或常量变量。
返回值:它返回写入的字节数和遇到的任何写入错误。
示例 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.
示例 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.
在上面的代码中,使用的常量变量是字符串,因此在输出中显示的两个字符串之间没有添加空格。
示例 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.
在上面的代码中,使用的常量变量是数字,因此在输出中显示的两个数字之间添加了空格。