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Work out \$x^y\$ using only addition and subtraction [duplicate]

The challenge is to implement a function or program that takes two numbers, \$x\$ and \$y\$ and return the result of \$x^y\$.

The program cannot use any other mathematical operation other than \$+\$ or \$-\$, so no multiplication or division. Functions built into languages are also not allowed.

The code in the least amount of bytes wins.

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\$\begingroup\$ I was groping toward this solution in a "traditional" mode; however, for some reason, I can never get APL to produce output on TIO - what might I be doing wrong? The test case I was trying with was +/4⍴+/3⍴3, to see if I was on the right track for 3^4. \$\endgroup\$

Jeff Zeitlin
– Jeff Zeitlin

2019年01月16日 14:12:47 +00:00
Commented Jan 16, 2019 at 14:12
\$\begingroup\$ @JeffZeitlin If you put code in TIO's Code field, you must use ⎕← to output. \$\endgroup\$

Adám
– Adám

2019年01月16日 14:16:20 +00:00
Commented Jan 16, 2019 at 14:16
\$\begingroup\$ Thanks. I don't know a facepalm emoticon/emoji, but consider it included here... \$\endgroup\$

Jeff Zeitlin
– Jeff Zeitlin

2019年01月16日 14:29:51 +00:00
Commented Jan 16, 2019 at 14:29
\$\begingroup\$ @JeffZeitlin 🤦︎ \$\endgroup\$

Adám
– Adám

2019年01月16日 14:34:13 +00:00
Commented Jan 16, 2019 at 14:34

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