第一步：定义一个接受两个数字的函数，类型为int。
第二步：求b=a+b；
第 3 步：然后 a = b – a 和 b = b – a
package main
import "fmt"
func swap(a, b int){
fmt.Printf("Before swapping, numbers are %d and %d\n", a, b)
b = a + b
a = b - a
b = b - a
fmt.Printf("After swapping, numbers are %d and %d\n", a, b)
}
func main(){
swap(23, 45)
swap(56, 100)
}输出结果Before swapping, numbers are 23 and 45 After swapping, numbers are 45 and 23 Before swapping, numbers are 56 and 100 After swapping, numbers are 100 and 56