Problem 813. Multiply 2 numbers

Created by Aurelien Queffurust
Appears in Combinatorics III

Difficulty:Rate

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Very easy, you just have to multiply 2 numbers but you cannot use the following signs (*, /, - ,^) ,mtimes , times, cross, prod, cumprod , dec2bin, int2str and num2str functions. Will you take up the challenge?!

Example : x= 3; y= 2;

output = 6 since 3*2 = 6 :)

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Last Solution submitted on Apr 20, 2025

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James on 9 Jul 2012

Can you please set a tolerance for the submitted answers? Using exp(log(x)+log(y)) fails nearly all possibilities for test case 5, with the biggest error being roughly 2.5e-11.

Ilias Patelakis on 24 Oct 2017

Nice one. It would be more challenging to add a test case where both function arguments are decimal numbers. :)

Jiahang Li on 4 Feb 2018

You can try adding, and something wonderful happens.

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Problem 813. Multiply 2 numbers

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Problem 813. Multiply 2 numbers

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