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
}
