using printf to print a floating number with varying precision

Question

A simple question.
I want to print a floating point number with precision given input from the user, i.e. for num=2.34567 and prec=2, I should print 2.35 as the answer, and for prec=3, I should print 2.346. How can we achieve this? (prec is given input from the user during runtime).
Thanks in advance.

Answer 1

This is probably what you are looking for:

float num = 2.34567;
int prec = 3;
printf("%.*f", prec, num);