Go language pointers as function parameters

Go Pointer

Go language allows passing pointers to functions; you just need to set the parameter type as a pointer in the function definition.

The following example demonstrates how to pass pointers to functions and modify the values within the function after the function call:

Example

package main

import "fmt"

func main() {
/* Define local variables */
var a int = 100
var b int= 200

fmt.Printf("Value of a before swap : %d\n\n", a )
fmt.Printf("Value of b before swap : %d\n\n", b )

/* Call the function to swap values
* &a points to the address of variable a
* &b points to the address of variable b
*/
swap(&a, &b);

fmt.Printf("Value of a after swap : %d\n\n", a )
fmt.Printf("Value of b after swap : %d\n\n", b )
}

func swap(x *int, y *int) {
var temp int
temp = *x /* Save the value at x's address */
*x = *y /* Assign y to x */
*y = temp /* Assign temp to y */
}

The above examples may output the following result:

交换前 a 的值 : 100
交换前 b 的值 : 200
交换后 a 的值 : 200
交换后 b 的值 : 100

Go Pointer

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