在Lua编程中嵌套if-else语句是合法的，这意味着在一个if或else if语句中可以使用另一个if或else if语句。

语法

嵌套if语句的语法如下 -

if( boolean_expression 1)
then
   --[ Executes when the boolean expression 1 is true --]
   if(boolean_expression 2)
   then
      --[ Executes when the boolean expression 2 is true --]
   end
end

使用与嵌套if语句类似的方式嵌套if else语句。

示例

--[ local variable definition --]
a = 100;
b = 200;

--[ check the boolean condition --]

if( a == 100 )
then
   --[ if condition is true then check the following --]
   if( b == 200 )
   then
      --[ if condition is true then print the following --]
      print("Value of a is 100 and b is 200" );
   end
end

print("Exact value of a is :", a );
print("Exact value of b is :", b );

构建并运行上面的代码时，会产生以下结果 -

Value of a is 100 and b is 200
Exact value of a is :    100
Exact value of b is :    200

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