%!PS

% begin included library code
% see https://codeberg.org/Firedrake/postscript-libraries/
/s2a {
    [ exch { } forall ]
} bind def

/test.end {
    ( ) print
    test.count 0 gt {
        (Passed ) print
        test.pass (...) cvs print
        (/) print
        test.count (...) cvs print
        ( \() print
        test.pass 100 mul test.count idiv (...) cvs print
        (%\)) print
        (\r\n) print
    } if
} bind def

/filter { % array proc(bool) -> array
    1 dict begin
    /p exch def
    [ exch
      {
          dup p not
          {
              pop
          } if
      } forall
    ]
    end
} bind def

/test.start {
    print (:) print
    /test.pass 0 def
    /test.count 0 def
} bind def

/test {
    /test.count test.count 1 add def
    {
        /test.pass test.pass 1 add def
    } {
        ( ) print
        test.count (....) cvs print
        (-fail) print
    } ifelse
} bind def


% end included library code

/percentageofcharacter {
    0 dict begin
    /c exch s2a 0 get def
    /a exch def
    /d a length def
    /n a s2a { c eq } filter length 100 mul def
    n d 2 idiv add d idiv
    end
} bind def

(percentageofcharacter) test.start
(perl) (e) percentageofcharacter 25 eq test
(java) (a) percentageofcharacter 50 eq test
(python) (m) percentageofcharacter 0 eq test
(ada) (a) percentageofcharacter 67 eq test
(ballerina) (l) percentageofcharacter 22 eq test
(analitik) (k) percentageofcharacter 13 eq test
test.end