Modular exponentiation problem

#1

Given a, b and c, we need to compute (a^b)%c. In my code 6/10 testcases are not passing. Can you please look into my code?

#2

The method you were using would give you a tle.
I have updated the code https://ide.codingblocks.com/s/288343

#3

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#4

Can you please explain the logic of your power function?

#5

It uses a binary exponentation method.
I am giving a link to Errichto’s video .https://www.youtube.com/watch?v=L-Wzglnm4dM
It is really easy and helpful to understand.