// for循环
func loop1() {
  sum := 0
  for i := 0; i < 100; i++ {
  sum += i
  }
  fmt.Printf("sum = %d\n", sum)
  // 和while循环一样
  sum1 := 3
  for sum1 <= 10 {
  sum1 += sum1
  }
  fmt.Printf("sum1 = %d\n", sum1)
}

// for-each使用
func loop2() {
  strs := []string{"小王", "小明"}
  for i, str := range strs {
  fmt.Printf("%v今天第%d次去核酸\n", str, i)
  }
  nums := [6]int{1, 2, 4, 6}
  for i, num := range nums {
  fmt.Printf("%d - %d\n", i, num)
  }
}

// break
func loop3() {
  var a int = 0
  var b int = 30
  for b > 0 {
  if a > 4 {
    break
  }
  a++
  b -= 3
  }
  fmt.Printf("a=%d,b=%d\n", a, b)
  var c int = 0
  var d int = 30
  for i := 0; i < 10; i++ {
  c++
  for j := 0; j < 10; j++ {
    if d < 0 {
    break
    }
    d--
  }
  }
  fmt.Printf("c=%d,d=%d\n", c, d)
  c = 0
  d = 30
loop1:
  for i := 0; i < 10; i++ {
  c++
  for j := 0; j < 10; j++ {
    if d < 0 {
    break loop1
    }
    d--
  }
  }
  fmt.Printf("c=%d,d=%d\n", c, d)
}

// continue
func loop4() {
  var c int = 0
  var d int = 30
  for i := 0; i < 10; i++ {
  c++
  for j := 0; j < 10; j++ {
    d--
    if d < 0 {
    continue
    }
  }
  }
  fmt.Printf("c=%d,d=%d\n", c, d)
  c = 0
  d = 30
loop1:
  for i := 0; i < 10; i++ {
  c++
  for j := 0; j < 10; j++ {
    d--
    if d < 0 {
    continue loop1
    }
  }
  }
  fmt.Printf("c=%d,d=%d\n", c, d)
}

//goto
func loop5() {
  m := 0
loop1:
  for m < 20 {
  fmt.Printf("loop1 -> %d\n", m)
  if m > 3 {
    break loop1
  }
  i := 0
  loop2:
  for i < 10 {
    i++
    if i == 5 {
    goto loop2
    }
    fmt.Printf("loop2 -> %d\n", i)
  }
  m++
  }
}