type conversion - c++ converting int to char + add leading zeros to char -

i got numbers 0 999. how can achieve following

int = 123;//possible values 0-999 char i_char[3] = /*do conversion of int char , add 3 leading zeros*/ 

example(s): i_char shall "001" i=1, "011" i=11 or "101" i=101

it appears looking sprintf, or perhaps printf.

int = 123; char str[10]; sprintf(str, "%03d", i);