C :

#include<stdio.h>
int main()
{
	double a,b,c,m;
	scanf("%lf%lf%lf",&a,&b,&c);
	if(a>b){m=a;a=b;b=m;}
	if(a>c){m=a;a=c;c=m;}
	if(b>c){m=b;b=c;c=m;}
	printf("%.2lf %.2lf %.2lf\n",a,b,c);
	getchar();
	getchar();
	return 0;
}

C++ :

#include <cstdio>
int main (void)
{
	double a,b,c;
	scanf("%lf%lf%lf",&a,&b,&c);
	if(a<=b&&b<=c)
		printf("%.2f %.2f %.2f\n",a,b,c);
	else if(b<=a&&a<=c)
		printf("%.2f %.2f %.2f\n",b,a,c);
	else if(a<=c&&c<=b)
		printf("%.2f %.2f %.2f\n",a,c,b);
    else if(c<=a&&a<=b)
		printf("%.2f %.2f %.2f\n",c,a,b);
	else if(b<=c&&c<=a)
		printf("%.2f %.2f %.2f\n",b,c,a);
	else printf("%.2f %.2f %.2f\n",c,b,a);
	return 0;
}

Python :

# coding=utf-8
s = input(). split()
a, b, c = float(s[0]), float(s[1]), float(s[2])
if a > b :
    a, b = b, a
if a > c :
    a, c = c, a
if b > c :
    b, c = c, b
print(format(a, ".2f"), format(b, ".2f"), format(c, ".2f"))