Go language study essay 2019-10-30

阳光穿透心脏的1/2处 2023-06-11 10:30 21阅读 0赞

# Go language study essay 2019-10-30 #

## 1. Conditional statements ##

### 1)if ###

if a > 10{
        //do something
    }

### 2)if-else ###

if a > 10{
        //do something
    } else{
        //do other things
    }

### Notice ###

else statements should be on the same line as the if statement’s ‘\}’,otherwise an error will be reported.

### 3)nested if ###

if a > 10{
        //do something
        if b < 10{
            //do something
        }
    }

### 4)switch ###

switch a{
        case 1:
          ...
        case 2:
          ...
        default:
          ...
    }

#### Notice ####

You don’t need to write ***break*** statement after ***case*** statement.  
If you want to continue excute the code which behind matched ***case*** statements,please use ***fallthrough***.

### 5)select ###

Select statement is like switch statement,but the different is that switch statement’s every case statement is a channel operation.Otherwise,select statement hasn’t conditional experession,his excution is random,for example:

var c1,c2 chan int
    var a,b int 
    switch{
        case c1 <- a:
            //send
        case b = <-c2:
            //receive
        default:
            //blabla...
    }

#### Notice ####

Go doesn’t have trinocular operator,so it doesn’t support the conditional judgment of the ?: form.

## 2.Loop statement ##

### 1)for loop ###

for i :=0; i < 10; i++{
        //do someting
    }
    
    for a < b{
        //do someting
    }
    
    for index,item := range numbers{
        //do someting
    }

### 2)nested loop ###

for i :=0; i < 10; i++{
        for j :=i; j < 10; j++{
            //do something
        }
    }

### 3)break,continue,goto ###

*  break

for i :=0; i < 10; i++{
        if a>5 {
            // if a>5 ,stop loop
            break
        }
    }

*  continue

for i :=0; i < 10; i++{
        if a == 5 {
            // skip this loop 
            i++
            continue
        }
    }

*  goto

LOOP: fmt.Println("lalala")
    for i :=0; i < 10; i++{
        if a == 5 {
            // stop loop and jump to line 1
            goto LOOP
        }
    }

#### Notice ####

forever loop:

for true{
        //I love you
    }