Golang : Print leading(padding) zero or spaces in fmt.Printf?
Problem :
You want to include leading zero or spaces in front(prefix) of integer when printing out with fmt.Println()
or fmt.Printf()
functions. How to do that?
Solution :
From https://golang.org/pkg/fmt/ - Other flags:
+
always print a sign for numeric values; guarantee ASCII-only output for %q (%+q)
-
pad with spaces on the right rather than the left (left-justify the field)
#
alternate format: add leading 0 for octal (%#o), 0x for hex (%#x);0X for hex (%#X); suppress 0x for %p (%#p); for %q, print a raw (backquoted) string if strconv.CanBackquote returns true; write e.g. U+0078 'x' if the character is printable for %U (%#U).
' '
(space) leave a space for elided sign in numbers (% d); put spaces between bytes printing strings or slices in hex (% x, % X)
0
pad with leading zeros rather than spaces; for numbers, this moves the padding after the sign
Code example :
package main
import "fmt"
func main() {
// you want to display 000108 (length = 6)
// pad zero to total length of 6
// d
fmt.Printf("Leading or padded with zero : |%06d|\n", 108)
// pad spaces in front(prefix)
fmt.Printf("Leading or padded with space : |%6d|\n", 108)
}
Output :
Leading or padded with zero : |000108|
Leading or padded with space : | 108|
References :
http://stackoverflow.com/questions/153890/printing-leading-0s-in-c
See also : Golang : Convert octal value to string to deal with leading zero problem
By Adam Ng
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