1，判断奇偶

for i := 0; i < 100; i++ {if i % 2 == 0 {    println(i)}if i & 0x1 == 0 {    println(i)}

}

2,交换两个数

func Swap(a, b *int) {	if *a^*b != 0 {		temp := *a		*a = *b		*b = temp	}}func Swap(a, b *int) {	if *a^*b != 0 {		*a = *a + *b		*b = *a - *b		*a = *a - *b	}}func Swap(a, b *int) {	if *a^*b != 0 {		*a ^= *b		*b ^= *a		*a ^= *b	}}

3，交换符号

func ExcangeSymbol(a int) (ret int) {	ret = ^a + 1	return}

4，求绝对值

func CalcAbs(a int) (ret int) {    ret = (a ^ a>>31) - a>>31    return}

5，二进制逆序

func ByteReverse(a int) int {    a = ((a & 0xAAAA) >> 1) | ((a & 0x5555) << 1)    a = ((a & 0xCCCC) >> 2) | ((a & 0x3333) << 2)    a = ((a & 0xF0F0) >> 4) | ((a & 0x0F0F) << 4)    a = ((a & 0xFF00) >> 8) | ((a & 0x00FF) << 8)    return a}

6，求1的个数

func CalcOneNum(a int) int {    a = ((a & 0xAAAA) >> 1) + (a & 0x5555)    a = ((a & 0xCCCC) >> 2) + (a & 0x3333)    a = ((a & 0xF0F0) >> 4) + (a & 0x0F0F)    a = ((a & 0xFF00) >> 8) + (a & 0x00FF)    return a}