Sha256: cafba31837de61dc3d93823010c23e76deef3d1da73377d25e85219230f8dfd0
Contents?: true
Size: 760 Bytes
Versions: 122
Compression:
Stored size: 760 Bytes
Contents
package grains
import (
"fmt"
)
// Square returns the number of grains on a square on a chess board where the
// first square has 1 and every subsequent square doubles the number.
func Square(num int) (uint64, error) {
if num < 1 || num > 64 {
return 0, fmt.Errorf("Input[%d] invalid. Input should be between 1 and 64 (inclusive)", num)
}
// a left shift is equivalent to multiplying by 2. So we need to left
// shift by num-1 times to get the number of grains on that square
return 1 << (uint16(num) - 1), nil
}
// Total returns the total number of grains on the chess board
func Total() uint64 {
// the number of grains added up to any point on the board is simply
// two to the power of that number - 1 (because maths)
return (1 << 64) - 1
}
Version data entries
122 entries across 122 versions & 1 rubygems