for典型用法
简单循环
无限循环
就近跳出循环
指定跳出
package main
import "fmt"
func main() {
fmt.Println("For_Simple:\n")
For_Simple()
fmt.Println("For_Ever:\n")
For_Ever()
fmt.Println("For_Break_One:\n")
For_Break_One()
fmt.Println("For_Break_Any:\n")
For_Break_Any()
}
func For_Simple() {
//标准For循环，注意表达式不带花括号
sum := 0
for i := 0; i < 10; i++ {
sum += i
}
fmt.Println("For_Simple:sum =", sum)
}
func For_Ever() {
//无限循环，后不跟表达式
sum := 0
for {
sum += 2
if sum > 100 {
break
}
}
fmt.Println("For_Ever:sum =", sum)
}
func For_Break_One() {
//break默认跳出本次循环，就近原则
for i := 0; i < 3; i++ {
for j := 0; j < 3; j++ {
if j == 2 {
break
}
fmt.Printf("i = %d,j = %d\n", i, j)
}
}
}
func For_Break_Any() {
//break后跟定义好的标志，可以指定跳跃
JumpTo:
for i := 0; i < 3; i++ {
for j := 0; j < 3; j++ {
if j == 2 {
break JumpTo
}
fmt.Printf("i = %d,j = %d\n", i, j)
}
}
}
