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
IF you gain some knowledge or the information here solved your programming problem. Please consider donating to the less fortunate or some charities that you like. Apart from donation, planting trees, volunteering or reducing your carbon footprint will be great too.
Advertisement
Tutorials
+7.9k Golang : Intercept and compare HTTP response code example
+20k Golang : GORM create record or insert new record into database example
+16.8k Golang : Check if a directory exist or not
+10.9k Golang : Flush and close file created by os.Create and bufio.NewWriter example
+6.8k Golang : get the current working directory of a running program
+18.3k Golang : Check if os.Stdin input data is piped or from terminal
+16.1k Golang : delete and modify XML file content
+8.2k Golang : Extract or copy items from map based on value
+8.9k Golang : Get current, epoch time and display by year, month and day
+5k Golang : Extract unicode string from another unicode string example
+9k Golang : Random Rune generator