How to pad strings and numbers with leading zeros in formatted output in Go?

In Go, you can pad strings and numbers with leading zeros in formatted output using the fmt package. The Printf function allows you to specify the width and padding character in the format string.

Here's an example that demonstrates how to pad strings and numbers with leading zeros:

package main

import "fmt"

func main() {
    str := "hello"
    num := 42

    // Pad string with leading zeros to a width of 8
    fmt.Printf("%08s\n", str) // Output: 000hello

    // Pad number with leading zeros to a width of 6
    fmt.Printf("%06d\n", num) // Output: 000042
}

In the format string, %0X is used to specify zero padding, where X represents the width. In the above example, %08s pads the string with leading zeros to a width of 8 characters, and %06d pads the number with leading zeros to a width of 6 digits.

You can change the width and padding character as per your requirements.