====== Mögliche Lösungen um Funktionswerte in Tabellen ausgeben zu können ======

===== Fortran =====

<code fortran table.F90>
program main
  implicit none
  
  call tabelle (-20, 20, 1);
end program

subroutine tabelle ( start, endw, step )
  implicit none
  integer start, endw, step
  integer k 
  
  if (step .LT. 1) then
    step = 1
  endif

  ! Tabellenkopf
  write (*,*) "+-------------------+"
  write (*,*) "|    x    |    y    |"
  write (*,*) "+-------------------+"
  
  ! x-y-Wertepaare ausgeben
  do k=start, endw, step
    write (*, '(1X,2H| ,I7,3H | , I7, 2H |)') k, (2*(k**2) + 4*k + 3)
  enddo
  
  write (*,*) "+-------------------+"
end subroutine
</code>

==== Zusatzaufgabe ====

<code fortran table2.F90>
program main
  implicit none
  external xsquare
  
  call tabelle (xsquare, -20, 20, 1);
end program

integer function xsquare ( x )
  integer x;
  xsquare = x**2;
  return;
end function

integer function myfunc ( k )
  implicit none
  integer k
  
  myfunc = (2*(k**2) + 4*k + 3)
end function

subroutine tabelle ( f, start, endw, step )
  implicit none
  integer start, endw, step, f
  integer k
  
  if (step .LT. 1) then
    step = 1
  endif

  ! Tabellenkopf
  write (*,*) "+-------------------+"
  write (*,*) "|    x    |    y    |"
  write (*,*) "+-------------------+"
  
  ! x-y-Wertepaare ausgeben
  do k=start, endw, step
    write (*, '(1X,2H| ,I7,3H | , I7, 2H |)') k, f(k)
  enddo
  
  write (*,*) "+-------------------+"
end subroutine
</code>

===== C =====

<code c table.c>
#include <stdio.h>

void table ( int start, int endw, int step )
{
    printf ("+-------------------+\n");
    printf ("|    x    |    y    |\n");
    printf ("+---------+---------+\n");
    
    if (step < 1)
        step=1;
    for (int i=start; i<=endw; i+=step)
    {
        printf ("| %7d | %7d |\n", i, (2*(i*i)+4*i+3));
    }
    printf ("+---------+---------+\n");
}

int main ()
{
    table ( -20, 20, 1);
}
</code>

==== Zusatzaufgabe ====

<code c table2.c>
#include <stdio.h>

int xsquare ( int i )
{
    return i*i;
}

void table ( int start, int endw, int step, int (*myfunc) (int) )
{
    printf ("+-------------------+\n");
    printf ("|    x    |    y    |\n");
    printf ("+---------+---------+\n");
    
    if (step < 1)
        step=1;
    for (int i=start; i<=endw; i+=step)
    {
        printf ("| %7d | %7d |\n", i, myfunc(i));
    }
    printf ("+---------+---------+\n");
}

int main ()
{
    table ( -20, 20, 1, xsquare);
}
</code>