go学习第四天、条件和循环

循环

Go语言仅支持循环关键字 for

for i := 0; i<5; i++

示例

while 条件循环

while(n<5)

n := 0
for n < 5 {
  n++
  fmt.Println(n)
}

while 无限循环

while(true)

for {
  ...
}

package loop

import "testing"

func TestWhileLoop(t *testing.T)  {
    n:=0
    for n<5{
        t.Log(n)
        n++
    }
}

输出

=== RUN   TestWhileLoop
--- PASS: TestWhileLoop (0.00s)
    loop_test.go:8: 0
    loop_test.go:8: 1
    loop_test.go:8: 2
    loop_test.go:8: 3
    loop_test.go:8: 4
PASS

Process finished with exit code 0

if 条件

if condition {
    // code to be executed if condition is true
} else {
    // code to be executed if condition is false
}

if condition-1 {
    // code to be executed if condition-1 is true
} else if condition-2 {
    // code to be executed if condition-2 is true
} else {
    // code to be executed if condition is false
}

• condition 表达式结果必须为布尔值
• 支持变量赋值

if var declaration; condition {
    // code to be executed if condition is true
}