GO基础知识(条件判断、循环)

条件判断

//if else
package main

import (
	"fmt"
)

func main() {
	if num := 10; num % 2 == 0 { //checks if number is even
		fmt.Println(num,"is even")
	}  else {
		fmt.Println(num,"is odd")
	}
	fmt.Println(num)//会报错，因为num的作用域只在if else语句中
}



//if  else if.... else
package main

import (  
    "fmt"
)

func main() {  
    num := 99
    if num <= 50 {
        fmt.Println("number is less than or equal to 50")
    } else if num >= 51 && num <= 100 {
        fmt.Println("number is between 51 and 100")
    } else {
        fmt.Println("number is greater than 100")
    }

}

//else需要放在if}的同一行
package main

import (  
    "fmt"
)

func main() {  
    num := 10
    if num % 2 == 0 { //checks if number is even
        fmt.Println("the number is even") 
    }  
    else {
        fmt.Println("the number is odd")
    }
} //报错：main.go:12:5: syntax error: unexpected else, expecting }

循环

//go语言中只有唯一的循环语句for
package main

import (  
    "fmt"
)

func main() {  
    for i := 1; i <= 10; i++ {
        fmt.Printf(" %d",i)
    }
}


//break,跳出循环
package main

import (  
    "fmt"
)

func main() {  
    for i := 1; i <= 10; i++ {
        if i > 5 {
            break //loop is terminated if i > 5
        }
        fmt.Printf("%d ", i)
    }
    fmt.Printf("
line after for loop")
}
/*
输出
1 2 3 4 5  
line after for loop
*/


//continue，跳出当前循环，执行下一次循环
package main

import (  
    "fmt"
)

func main() {  
    for i := 1; i <= 10; i++ {
        if i%2 == 0 {
            continue
        }
        fmt.Printf("%d ", i)
    }
}
/*输出结果
1 3 5 7 9
*/