5.28 · exercise

Binary broadcast

Print a byte the way the machine sees it: eight binary digits, so 99 prints as 01100011. The starter reads the value, from 0 to 255.

There is no %b in printf, so print the digits one at a time. For each bit position from 7 down to 0, shift the value right by that many places, use and to keep only the lowest bit, and print that digit. One newline at the end.

What is checked

  • the eight binary digits on one line
  • the program exits cleanly
  • each digit is extracted with shifts and masks (lsr and and, no preformatted string)
  • the same holds for other values you do not see, 0 and 255 among them

specification

stdin99
stdoutprints the right output
exitexits with the right code
sourceuses lsr
sourceuses and
hiddenright output and exit code on 4 more inputs you do not see

We run your program on the input above and on the hidden ones, and compare what it does. Nothing is matched against a stored solution.

loading editor...

regfile

N clearZ clearC clearV clear

x0–x30 are the integer registers.

X0arg00x0000000000000000
X1arg10x0000000000000000
X2arg20x0000000000000000
X3arg30x0000000000000000
X4arg40x0000000000000000
X5arg50x0000000000000000
X6arg60x0000000000000000
X7arg70x0000000000000000
X8ind0x0000000000000000
X90x0000000000000000
X100x0000000000000000
X110x0000000000000000
X120x0000000000000000
X130x0000000000000000
X140x0000000000000000
X150x0000000000000000
X16ip00x0000000000000000
X17ip10x0000000000000000
X18pr0x0000000000000000
X190x0000000000000000
X200x0000000000000000
X210x0000000000000000
X220x0000000000000000
X230x0000000000000000
X240x0000000000000000
X250x0000000000000000
X260x0000000000000000
X270x0000000000000000
X280x0000000000000000
X29fp0x0000000000000000
X30lr0x0000000000000000
SP0x0000000080000000
PC0x0000000000400000
console

Output prints here as your program runs.

Press step or run under the editor, or feed stdin from the box below.

not assembled

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