How to get the length of integer numbers ?

hello,

i newbie arduino, , last c++ coding experiences  many years ago...

i looking way position correctly integer number on lcd display. want place them right-aligned on display, need know length = number of characters of value.
example: looking function output of 3 input 100, 4 input -200, or 2 input 15.

my first approach convert number (int type) string, , use sizeof() command, found no appropriate  type conversion.

or there other feasible way placing values correctly right-aligned on lcd ?

regards,
tütenflieger

you can use itoa function convert string, , strlen function length of string.

or, simple nested if test:

code: [select]

int somevalue = 14156;
int vallen = 0;

if(somevalue > 9999)
  vallen = 5;
else if(somevalue > 999)
  vallen = 4;
else if(somevalue > 99)
  vallen = 3;
else if(somevalue > 9)
  vallen = 2;
else
  vallen = 1;

you'd need make changes if number negative (test absolute value , add 1 length).

if you're going pad spaces right align, might want @ using sprintf %nd format specifier, replacing n maximum number of digits value can have. way, padding done you, , strings same (known) length.

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