Project Euler/20
From charlesreid1
Sum of Factorial Digits
For this problem, you're asked to sum the digits of 100!. This is a very quick task using a Java library like BigInteger - the Go programming language also has the facilities built-in to handle numbers as large as 800!.
https://git.charlesreid1.com/charlesreid1/hello-world/src/master/go/factorial.go
To do this in Java, you can use the BigInteger class, convert it to a String, and then turn the characters in the string into digits one at a time to sum them up.
Code: https://git.charlesreid1.com/cs/euler/src/master/scratch/Round1_001-020/020/Quick.java
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Project Euler project euler notes
Round 1: Problems 1-20 Problem 1 · Problem 2 · Problem 3 · Problem 4 · Problem 5 · Problem 6 · Problem 7 · Problem 8 · Problem 9 · Problem 10 Problem 11 · Problem 12 · Problem 13 · Problem 14 · Problem 15 · Problem 16 · Problem 17 · Problem 18 · Problem 19 · Problem 20 Round 2: Problems 50-70 Problem 51 · Problem 52 · Problem 53 · Problem 54 · Problem 55 · Problem 56 · Problem 57 · Problem 58 · ... · Problem 61 · Problem 62 · Problem 63 · Problem 64 · Problem 65 · Problem 66 · Problem 67 Round 3: Problems 100-110 Problem 100 · Problem 101 · Problem 102 Round 4: Problems 500-510 Problem 500 · Problem 501 * · Problem 502 * Round 5: Problems 150-160 Round 6: Problems 250-260 Round 7: Problems 170-180
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