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 语言中的fmt.Printf()函数根据格式说明符格式化并写入标准输出。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 Printf(format string, a ...interface{}) (n int, err error)参数：此函数接受两个参数，如下所示：
- 格式字符串：这包含一些字符串和一些动词。
- a …interface{}：它包含指定的常量变量。
返回值：它返回写入的字节数和遇到的任何写入错误。
转换字符：
| Conversion Characters | Description |
|---|---|
| %b | It is used to format base 2 numbers |
| %o | It is used to format base 8 numbers |
| %O | It is used to format base 8 numbers with 0o prefix |
| %d | It is used to format base 10 numbers with lower-case letters for a-f |
| %x | It is used to format base 16 numbers with upper-case letters for A-F |
| %X | It is used to format base 16 numbers |
| %g | It is used to format float values |
| %s | It is used to format string values |
| %t | It is used to format true or false values |
| %e | It is used to format scientific values |
示例 1：
Go
// Golang program to illustrate the usage of
// fmt.Printf() function
// Including the main package
package main
// Importing fmt
import (
"fmt"
)
// Calling main
func main() {
// Declaring some const variables
const name, dept = "GeeksforGeeks", "CS"
// Calling Printf() function
fmt.Printf("%s is a %s Portal.\n", name, dept)
// It is conventional not to worry about any
// error returned by Printf.
}Go
// Golang program to illustrate the usage of
// fmt.Printf() function
// Including the main package
package main
// Importing fmt
import (
"fmt"
)
// Calling main
func main() {
// Declaring some const variables
const num1, num2, num3 = 5, 10, 15
// Calling Printf() function
fmt.Printf("%d + %d = %d\n", num1, num2, num3)
// It is conventional not to worry about any
// error returned by Printf.
}Go
// Golang program to illustrate the usage of
// fmt.Printf() function
// Including the main package
package main
// Importing fmt
import (
"fmt"
)
// Calling main
func main(){
var str = "Geeksforgeeks"
fmt.Printf("The string is %s \n", str)
var num1 int = 21
fmt.Printf("The decimal value is %d \n", num1)
var num2 float32 = 7.786
fmt.Printf("The floating point is %g \n", num2)
var num3 int = 14
fmt.Printf("The binary value of num3 is %b \n", num3)
var num4 = 4 + 1i
fmt.Printf("Scientific Notation of num4 : %e \n", num4)
}输出：
GeeksforGeeks is a CS portal.示例 2：
去
// Golang program to illustrate the usage of
// fmt.Printf() function
// Including the main package
package main
// Importing fmt
import (
"fmt"
)
// Calling main
func main() {
// Declaring some const variables
const num1, num2, num3 = 5, 10, 15
// Calling Printf() function
fmt.Printf("%d + %d = %d\n", num1, num2, num3)
// It is conventional not to worry about any
// error returned by Printf.
}
输出：
5 + 10 = 15示例 3：
去
// Golang program to illustrate the usage of
// fmt.Printf() function
// Including the main package
package main
// Importing fmt
import (
"fmt"
)
// Calling main
func main(){
var str = "Geeksforgeeks"
fmt.Printf("The string is %s \n", str)
var num1 int = 21
fmt.Printf("The decimal value is %d \n", num1)
var num2 float32 = 7.786
fmt.Printf("The floating point is %g \n", num2)
var num3 int = 14
fmt.Printf("The binary value of num3 is %b \n", num3)
var num4 = 4 + 1i
fmt.Printf("Scientific Notation of num4 : %e \n", num4)
}
输出：
The string is Geeksforgeeks
The decimal value is 21
The floating point is 7.786
The binary value of num3 is 1110
Scientific Notation of num4 : (4.000000e+00+1.000000e+00i)