How Can I Reuse Arguments in Go's `fmt.Printf` Function?

Reusing Arguments in fmt.Printf

In certain programming scenarios, it can be useful to reuse an argument in the fmt.Printf function. Consider the following example:

fmt.Printf("%d %d", i, i)

This code will print the value of the variable i twice, using separate format specifiers. However, we may desire to reuse the same i argument for both specifiers.

Solution:

To reuse an argument in fmt.Printf, you can utilize the [n] notation. This notation allows you to specify explicit argument indexes within the format string.

For instance, to reuse the i argument in our previous example, we can use the following code:

fmt.Printf("%[1]d %[1]d\n", i)

In this updated code, the [1] notation specifies that the first argument passed to Printf should be used for both format specifiers.

Example:

The following example demonstrates the use of the [n] notation:

package main

import "fmt"

func main() {
    i := 10
    fmt.Printf("%[1]d %[1]d\n", i)
}

Output:

10 10

In this example, the value of i is printed twice, using the same argument.

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