Go 传递指针给函数

package main



import "fmt"



func main() {

   /* local variable definition */

   var a int = 100

   var b int= 200



   fmt.Printf("Before swap, value of a : %d\n", a )

   fmt.Printf("Before swap, value of b : %d\n", b )



   /* calling a function to swap the values.

   * &a indicates pointer to a ie. address of variable a and

   * &b indicates pointer to b ie. address of variable b.

   */

   swap(&a, &b);



   fmt.Printf("After swap, value of a : %d\n", a )

   fmt.Printf("After swap, value of b : %d\n", b )

}

func swap(x *int, y *int) {

   var temp int

   temp = *x    /* save the value at address x */

   *x = *y      /* put y into x */

   *y = temp    /* put temp into y */

}