0451~0500

/**
 * @param a: An integer
 * @param op: A character, +, -, *, /.
 * @param b: An integer
 * @return: The result
 */
func Calculate(a int, op byte, b int) int {
    // write your code here
    res := 0
    switch op {
        case '+' :
        res = a + b
        case '-' :
        res = a - b
        case '*' :
        res = a * b
        case '/' :
        res = a / b
    }
    return res
}

/**
 * Definition for singly-linked list.
 * type ListNode struct {
 *     Val int
 *     Next *ListNode
 * }
 */
/**
 * @param head: the head of linked list.
 * @return: An integer list
 */
func ToArrayList(head *ListNode) []int {
    // write your code here
    slice := make([]int,0)
    for head != nil{
        slice = append(slice,head.Val)
        head = head.Next
    }
    return slice
}

/**
 * @param a: An integer array
 * @param index1: the first index
 * @param index2: the second index
 * @return: nothing
 */
func SwapIntegers(a []int, index1 int, index2 int)  {
    // write your code here
    a[index1],a[index2] = a[index2],a[index1]
}

/**
 * @param size: An integer
 * @return: An integer list
 */
func Generate(size int) []int {
    // write your code here
    slice := make([]int, size)
    for i := 0; i < size; i++ {
        slice[i] = i + 1
    }
    return slice
}