Problem 2396. last n digit of a power function

Created by Omer

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Calculate the power of a given a base, exponent. Return the last n digit number.

Example 1:
base = 3; expo = 8; n = 3;
3^8 = 6561
return the last 3 digit number 561.

Example 2:
base = 3; expo = 10; n = 3;
3^10 = 59049
return the last 3 digit number 49.

base, exponent and n are natural numbers

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Last solution submitted on Nov 20, 2018

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Jihye Sofia Seo on 12 Feb 2017

I think the third test case is wrong. Anyone else has problem??

Solution Comments

Solution 465535

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James on 2 Jul 2014

Whoops. The answer needs to be a number, not a string.

Solution 465056

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Omer on 2 Jul 2014

great! well done

Solution 464773

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Guillaume on 1 Jul 2014

Admittedly, I know very little about Java but I'm suprised this work since I can't find a constructor that takes a double. Only strings, byte patterns or random number generators. Care to explain?

Clemens Giegerich on 2 Jul 2014

There are a constructors for int and double: http://docs.oracle.com/javase/1.5.0/docs/api/java/math/BigDecimal.html#BigDecimal(int)
http://docs.oracle.com/javase/1.5.0/docs/api/java/math/BigDecimal.html#BigDecimal(double)

Guillaume on 2 Jul 2014

Oh yes, I missed that you were using BigDecimal instead of BigInteger.

Omer on 2 Jul 2014

i have a 25 sized solution but it doesnt accept since i used symbolic toolbox :)

Solution 464605

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1 Comment

Omer on 1 Jul 2014

good effort!

Problem 2396. last n digit of a power function

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Problem 2396. last n digit of a power function

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Last 200 Solutions

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