5.54 · exercise

Say it with a frame

Draw a box around one word read from input. For the input hello:

+------------+
| hello      |
+------------+

The starter reads the word into word_buf and already holds the middle line's format string, fmt_mid. Add a border string to .data (a +, twelve -, a +), then print three lines: the border, the middle line, and the border again. One border string is enough; load its address into x0 a second time for the bottom line.

printf prints exactly the characters it is given and never adds a line break of its own, so the border string needs its own \n. In fmt_mid, %-10s is replaced by the string whose address is in x1, padded with spaces to 10 characters, which keeps the right edge in place for any word. The starter's scanf cuts a longer word to its first 10 characters.

What is checked

  • with input hello the output is exactly the three lines above
  • the program exits cleanly
  • the program also runs on words you do not see: one of exactly 10 letters, one longer than 10, and no word at all

specification

stdinhello
stdoutprints the right output
exitexits with the right code
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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