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!.
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.
Project Eulerproject euler notes
Round 1: Problems 1-20
Round 2: Problems 50-70
Round 3: Problems 100-110
Round 4: Problems 500-510
Round 5: Problems 150-160
Round 6: Problems 250-260
Round 7: Problems 170-180Flags · Template:ProjectEulerFlag · e