go语言基础之匿名变量和多重赋
1、匿名变量
package main //必须有一个main包 import "fmt" func test() (a, b, c int) { return 1, 2, 3 } func main() { var c, d, e int c, d, e = test() //return 1, 2, 3 fmt.Printf("c = %d, d = %d, e = %d\n", c, d, e) //_匿名变量,丢弃数据不处理, //_匿名变量配合函数返回值使用,才有优势 _, d, _ = test() fmt.Printf("d = %d\n", d) }
#执行结果:
c = 1, d = 2, e = 3
#只取d的值 d = 2
2、多重赋值
示例1:
package main //必须有一个main包 import "fmt" func main() { a, b := 10, 20 var tmp int a = b b = tmp fmt.Printf("a = %d, b = %d\n", a, b) }
#执行结果:
a = 20, b = 0
示例2:
package main //必须有一个main包 import "fmt" func main() { i, j := 10, 20 i, j = j, i fmt.Printf("i = %d, j = %d\n", i, j) }
#执行结果:
i = 20, j = 10