This is METAFONT, WAITS Version -59.0 (preloaded base=plain 84.5.27)  27 MAY 1984 02:00
**exp
(EXP.MF[MF,DEK]
gimme an exp: identity scaled .5

>> (0,0,0.5,0,0,0.5)
! OK.
<for...> ...xp;scrollmode;showall.the_exp;
                                           ENDFOR
l.17 endfor
           

gimme an exp: identity slanted .5

>> (0,0,1,0.5,0,1)
! OK.
<for...> ...xp;scrollmode;showall.the_exp;
                                           ENDFOR
l.17 endfor
           

gimme an exp: identity rotated 90 shifted (2,3)

>> (2,3,0,-1,1,0)
! OK.
<for...> ...xp;scrollmode;showall.the_exp;
                                           ENDFOR
l.17 endfor
           

gimme an exp: identity zscaled (3,5)

>> (0,0,3,-5,5,3)
! OK.
<for...> ...xp;scrollmode;showall.the_exp;
                                           ENDFOR
l.17 endfor
           

gimme an exp: ;exitif true;

! An expression can't begin with `;'.
<inserted text> 
                0
<to be read again> 
                   ;
the_exp->;
          exitif.true;
<for...> ...exp;scrollmode;showall.the_exp
                                          ; ENDFOR
l.17 endfor
           
I'm afraid I need some sort of value in order to continue,
so I've tentatively inserted `0'. You may want to
delete this zero and insert something else;
see Chapter xx of The METAFONTbook for an example.

>> 0
! OK.
<recently read> ;
                 
the_exp->;
          exitif.true;
<for...> ...exp;scrollmode;showall.the_exp
                                          ; ENDFOR
l.17 endfor
           

)
*end