lavos/cap3/ex8.go

package cap3

// Ex8 高位到低位输出正整数的数字
func Ex8(num uint64, algoType AlgoType, callback func(digit uint8)) {
    switch algoType {
    case AlgoTypeRecursion:
        Ex8Recursion(num, callback)
    default:
        Ex8NoneRecursion(num, callback)
    }
}

// Ex8Recursion 高位到低位输出正整数的数字(递归)
func Ex8Recursion(num uint64, callback func(digit uint8)) {
    if num < 10 {
        callback(uint8(num))
    } else {
        // 跟ex7的小区别
        Ex8Recursion(num/10, callback)
        callback(uint8(num % 10))
    }
}

// Ex8NoneRecursion 高位到低位输出正整数的数字(非递归)
func Ex8NoneRecursion(num uint64, callback func(digit uint8)) {
    digits := make([]uint8, 0, 20)
    for i := num; i >= 1; i /= 10 {
        digits = append(digits, uint8(i%10))
    }

    for i := len(digits) - 1; i >= 0; i-- {
        callback(digits[i])
    }
}