Logo

Programming-Idioms

# 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%"
New implementation

Be concise.

Be useful.

All contributions dictatorially edited by webmasters to match personal tastes.

Please do not paste any copyright violating material.

Please try to avoid dependencies to third-party libraries and frameworks.

Other implementations 
#include <stdio.h>
char s[7];
sprintf(s, "%.2lf%%", x * 100);
#include <format>
auto s = std::format("{.1f}%", x * 100);
string s = $"{x:p1}";
import std.string : format;
string percent = format("%.1f%%", x * 100.0);
var s = "${(x * 100).toStringAsFixed(1)}%";

s = "#{Float.round(x * 100, 1)}%"
write (*,'(F5.1,"%")') x*100.
import "fmt"
s := fmt.Sprintf("%.1f%%", 100.0*x)
s = Numeric.showFFloat (Just 1) (100*x) "%"
const percentFormatter = new Intl.NumberFormat('en-US', {
  style: 'percent',
  maximumSignificantDigits: 3
});

const s = percentFormatter.format(x);
const s = Math.round (x * 1000) / 10 + '%'
import static java.math.RoundingMode.HALF_UP;
import static java.text.NumberFormat.getPercentInstance;
import java.text.NumberFormat;
NumberFormat f = getPercentInstance();
f.setMaximumFractionDigits(1);
f.setRoundingMode(HALF_UP);
String s = f.format(x);
import java.text.DecimalFormat;
String s = new DecimalFormat("0.0%").format(x);
String s = "%.1f%%".formatted(x * 100);
local s = (x-x%10^-3)*100 .."%"
s = string.format("%.1f%%", x*100)
$s = number_format($x * 100.0, 1) . '%';
SysUtils
s :=format('%.1f%%', [100.0*x]);  
my $s = sprintf '%.1f%%', $x * 100;
s = f"{x:.01%}"
s = '{:.1%}'.format(x)
s = "%.1f%%" % (100 * x)
let s = format!("{:.1}%", 100.0 * x);

Preview