c++ - padding with sprintf

Question

I have a dummy question. I would like to print an integer into a buffer padding with 0 but I cannot sort it out the sprintfformat. I am trying the following

char buf[31];
int my_val = 324;
sprintf( buf, "%d030", my_val );

hoping to have the following string

"000000000000000000000000000324"

what am I doing wrong? It doesn't mean pad with 0 for a max width of 30 chars?

Answer 1

"%030d" is the droid you are looking for