Printf spaces if number < 10 using only printf

Question

So, i have three numbers that can be < 100;

How can i printf those numbers to look like this:

{10, 5,20}
{ 1, 6, 2}
{19,18, 7}

instead of this

{10,5,20}
{1,6,2}
{19,18,7}

and it is possible to use only printf(no ifs)?

Did you check the man page for printf? Which part you did not understand? — Sourav Ghosh, Nov 02 '17 at 11:47
Maybe all you need is [a good reference page](http://en.cppreference.com/w/c/io/fprintf)? Or [a good beginners book](http://stackoverflow.com/questions/562303/the-definitive-c-book-guide-and-list)? — Some programmer dude, Nov 02 '17 at 11:49
`printf("{%2d,%2d,%2d}\n",i,j,k);` would do it for you.. Checking the manual for commands is strongly suggested though ;) Good luck — sjsam, Nov 02 '17 at 11:53

unalignedmemoryaccess · Accepted Answer · 2017-11-02T11:53:16.380

0

printf("%2d", yournumber) will print number with 2 characters. If number is less than 2 chars long, spaces will be included before number.

In case number is bigger than 2 digits, modifier has no effect and entire number will be printed.

printf("%2d", 1);   //  " 1"
printf("%2d", 10);  //  "10"
printf("%2d", 100); // "100"

edited Nov 02 '17 at 11:53

answered Nov 02 '17 at 11:51

Why 10, specifically? – Sourav Ghosh Nov 02 '17 at 11:52
Oops, I mislead. It should be `2` as 10 are 2 digits. – unalignedmemoryaccess Nov 02 '17 at 11:53
`print number with 2 characters.` is not the right explanation I'm afraid. It just sets the width of the field to 2 chars, may be? – sjsam Nov 02 '17 at 11:56
@sjsam it sets width to `2` characters, not `10`? :) – unalignedmemoryaccess Nov 02 '17 at 11:57

score 0 · Answer 2 · answered Nov 02 '17 at 11:52

0

You have to specify the width of the field using "%2d", you can change 2 for the width that you like.

#include <stdio.h>

int main() {
    printf("%2d,%2d,%2d\n", 10,5,20);
    return 0;
}

answered Nov 02 '17 at 11:52

Tiago Vieira

2 Answers2