当使用if , else if , else语句有几点要记住使用：
if可以有零或一个else，它必须跟从else if后面。
一个if可以有零到个多else if并且它们必须在else之前。
一旦一个else if测试成功，其它任何剩余else if将不会被测试。
语法
if...else if...else在Go编程语言中语句的语法是：
if(boolean_expression 1)
{
/* Executes when the boolean expression 1 is true */
}
else if( boolean_expression 2)
{
/* Executes when the boolean expression 2 is true */
}
else if( boolean_expression 3)
{
/* Executes when the boolean expression 3 is true */
}
else
{
/* executes when the none of the above condition is true */
}
例子：
package main
import "fmt"
func main() {
/* local variable definition */
var a int = 100
/* check the boolean condition */
if( a == 10 ) {
/* if condition is true then print the following */
fmt.Printf("Value of a is 10n" )
} else if( a == 20 ) {
/* if else if condition is true */
fmt.Printf("Value of a is 20n" )
} else if( a == 30 ) {
/* if else if condition is true */
fmt.Printf("Value of a is 30n" )
} else {
/* if none of the conditions is true */
fmt.Printf("None of the values is matchingn" )
}
fmt.Printf("Exact value of a is: %dn", a )
}
让我们编译和运行上面的程序，这将产生以下结果：
None of the values is matching Exact value of a is: 100
