Golang bit operation

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package main import  (     "FMT")  //  get all even func even between 0-n (a  int)   (array []int)  {    for i := 0; i <  a; i++ {        if i&1 == 0 {  //  bitwise operators & As used in C language              Array = append (array, i)         }     }    return array} //  swaps the value of two variables//  does not need to use the third variable to do the intermediate variable Func swap (a ,  b int)   (int, int)  {    a ^= b //  xor equals operation     b ^= a    a ^= b    return  a, b} //  left shift, right shift operation Func shifting (A int)  int {    a  = a << 1    a = a >> 1    return a}    Transform symbol func nagation (a int)  int {        //   NOTE:  c language is  ~a+1 this way     return ^a + 1 //  The go language is different from the C language, the go language does not support the ~ symbol. } func main ()  {    fmt. Printf ("even: %v\n",  even (+))     a, b := swap (100, 200)     fmt. Printf ("swap: %d\t%d\n",  a, b)     fmt. Printf ("shifting: %d\n",  shifting (+))     fmt. Printf ("nagation: %d\n",  nagation (100))}