ESP8266 Community Forum

- Mon Dec 03, 2018 6:40 am #79388 I had a search but couldn't see anything on this....

Code: Select allSerial.printf("Time: %2d:%.2d:%.2d", 10, 11, 5);

outputs:
Time: 10:%.2d:%.2d
instead of:
Time: 10:11:05

apologies if this has been covered B4 !

- Mon Dec 03, 2018 7:20 am #79390 An integer value can't contain a precision specifier (the "." dot), try this instead:

Code: Select allSerial.printf("Time: %2d:%2d:%2d", 10, 11, 5);

Assumption is the mother of all f*ckups. At least: that's what I'm assuming.

- Mon Dec 03, 2018 7:37 am #79391

An integer value can't contain a precision specifier (the "." dot), try this instead:

Code: Select allSerial.printf("Time: %2d:%2d:%2d", 10, 11, 5);

Thanks for your quick reply
Your code is using the width format specifier

Your link to the reference page shows:

.precision
.number
For integer specifiers (d, i, o, u, x, X): precision specifies the minimum number of digits to be written. If the value to be written is shorter than this number, the result is padded with leading zeros.

This works in all other c compilers I've used
I really can't believe I'm the first to notice this
Or is this just a 'known feature' ?

- Mon Dec 03, 2018 11:40 am #79397 Ah yes, ignore my reply; just like with my own language (Pascal) you should be able to use precision with integer values in C++, not sure why it doesn't in your example.

Assumption is the mother of all f*ckups. At least: that's what I'm assuming.