Logo

Programming-Idioms

This language bar is your friend. Select your favorite languages!
  • Perl

Idiom #65 Format decimal number

From the real value x in [0,1], create its percentage string representation s with one digit after decimal point. E.g. 0.15625 -> "15.6%"

my $s = sprintf '%.1f%%', $x * 100;

sprintf uses % as an escape character for its formatting codes, therefore use %% to generate a literal %.
#include <stdio.h>
char s[7];
sprintf(s, "%.2lf%%", x * 100);

New implementation...