Ascending order of 3 accepted numbers

Write a program to accept three number and display these number in ascending order.

#include<iostream.h>

void  main()

{

      int a,b,c;

      cout << "Enter 3 numbers ";

      cin >> a >> b >> c;

      if( a<=b  && a<=c)

      {     cout << a << ", " ;

            if( b<=c )

                  cout << b << ", " << c;

            else

                  cout << c << ", " << b;

      }

if( b<=a  && b<=c)

      {     cout << b << ", " ;

            if( a<=c )

                  cout << a << ", " << c;

            else

                  cout << c << ", " << a;

      }

if( c<=b  && c<=a)

      {     cout << c << ", " ;

            if( a<=b )

                  cout << a << ", " << b;

            else

                  cout << b << ", " << a;

      }

}