Extra leading zeros when printing float using printf?
Solution 1
With the %f
format specifier, the "2" is treated as the minimum number of characters altogether, not the number of digits before the decimal dot. Thus you have to replace it with 4 to get two leading digits + the decimal point + one decimal digit.
printf("%d:%02d:%04.1f hours\n", 1, 4, 2.123456);
Solution 2
Try %04.1f
instead of %02.1f
. The "4" here means at least 4 characters will be printed, and "2.1" has 3 (> 2) characters, so to enable the padding zeros you need 4.
Related videos on Youtube
shoosh
Working as a Software Engineer Millennium projects: https://github.com/shooshx CycleBlob, Lightcycle on a 3d surface using WebGL http://cycleblob.com
Updated on August 02, 2020Comments
-
shoosh over 3 years
I'd like to be able to write a time string that looks like this:
1:04:02.1 hours
using printf.
When I try to write something like this:printf("%d:%02d:%02.1f hours\n", 1, 4, 2.123456);
I get:
1:04:2.1 hours
Is it possible to add leading zeros to a float formatting?
-
wuppi over 7 yearshaving this for non-floats is also nice !
-
Mohammad Kholghi over 2 yearsHow about negative numbers? I'd want sth like:
-00.1
-
Mohammad Kholghi over 2 yearsFirst, turn it to positive
f = fabsf(f)
, then-0%.1f
. This works well forf<10
. Forf>10
-> its like-010.3
. I don't want the leading0
:-10.3
. Any better ideas?