C :

#include<stdio.h>
int main()
{
  int a,b,c,t;
  scanf("%d%d%d",&a,&b,&c);
  if(a>b){t=a;
          a=b;
          b=t;}
  if(a>c){t=a;
          a=c;
          c=t;}
  if(b>c){t=b;
          b=c;
          c=t;}
  printf("%d %d %d\n",a,b,c);
         }
    

C++ :

#include<cstdio>
#include<iostream>
#include<algorithm>
using namespace std;
int a[3];
int main()
{
    int i,j,k;
    int t,n,m;
    while(scanf("%d%d%d",&a[0],&a[1],&a[2])!=EOF)
    {
        sort(a,a+3);
        printf("%d %d %d\n",a[0],a[1],a[2]);
    }
    return 0;
}