Problem 45497. Four digit number ABCD reversal

write a MATLAB function to find the four-digit number ABCD when multiplied by 4 returns DCBA. The function takes an input x=4.

Solve

Last Solution submitted on Oct 30, 2025

Michael on 7 May 2020

You really shouldn't give away the answer in the test suite. ;-)

You could change the test suite to something like:

assert (str2num(fliplr(num2str(y))) == y*4);

Although this also sort of gives away one possible solution.

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