how to use octave on hackerrank website?

hi there,

now I am trying to use octave to do the hackerrank test, but everytime I click on the 'Run code' button, it always says that 'no response on stdout', here is the code and note:

# Enter your code here. Read input from STDIN. Print output to STDOUT
a = stdin;
pivot = a(1);
equal = pivot;
left = a(a<pivot);
right = a(a>pivot);
stdout = [left equal right];

Does anyone knows this? Many thanks!

[Geoff Hayes]

Weiqian - perhaps try usig printf instead. Also, is

stdout = [left equal right];

the correct syntax for using stdout?

[Weiqian Jiang]

Hi Hayes, thanks for replying, I am not sure whether my syntax is correct, I just did what is correct form in matlab, and I also tried using printf: printf(stdout), but it still results in the same error...

[Rik]

Have you checked the Octave doc?

[Geoff Hayes]

You could try just

printf('<format_string>',yourVariables)

which should (?) print the output to stdout.

[Weiqian Jiang]

hi, thanks for answering, I have solved this problem by the following code, and the result is the same as the expect output: 3 2 4 5 7, but my output is 3 2 4 5 7, expected output is 3 2 4 5 7, so my result is error- -|| Does anyone know why? My code is as follows:

n = scanf('%d',1);
a = scanf("%d",[1,n]);
pivot = a(1);
equal = pivot; left = []; right = []; b = [];
for i = 1:length(a)-1
    if a(i+1)<equal
        left = [left,a(i+1)];
    elseif a(i+1)>equal
        right = [right,a(i+1)];
    end;
end;
b = [left,equal,right];
disp(b);

[Geoff Hayes]

Weiqian - if you need exactly one space between each character then perhaps try something like

printf('%d', b(1));
for k = 2:length(b)
    printf(' %d')
end

instead of disp.

[Weiqian Jiang]

hi Geoff, thanks for your reply, I used 'fprintf('%d ',b);' and it works,thanks.