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# Lua if...else Statement [ Lua Flow Control](#) * * * ## if...else Statement A Lua `if` statement can be paired with an `else` statement. The code block in the `else` statement is executed when the `if` condition expression evaluates to `false`. The syntax for the Lua `if...else` statement is as follows: if( boolean_expression) then -- else -- end The code block inside the `if` is executed when the boolean expression is `true`, and the code block inside the `else` is executed when the boolean expression is `false`. In Lua, `false` and `nil` are considered false, while `true` and any non-nil value are considered true. Note that in Lua, `0` is considered `true`. The flowchart for an `if` statement is as follows:  ### Example The following example checks the value of variable `a`: ## Example -- a =100; -- if( a <20) then -- print("a is less than 20") else -- print("a is greater than 20") end print("value of a is :", a) The output of the above code is: a is greater than 20 value of a is :100 * * * ## if...elseif...else Statement A Lua `if` statement can be paired with `elseif...else` statements. The `elseif...else` statement code block is executed when the `if` condition expression is `false`, and is used to check multiple conditional statements. The syntax for the Lua `if...elseif...else` statement is as follows: if( boolean_expression 1) then -- elseif( boolean_expression 2) then -- elseif( boolean_expression 3) then -- else -- end ### Example The following example checks the value of variable `a`: ## Example -- a =100 -- if( a ==10) then -- print("value of a is 10") elseif( a ==20) then -- print("value of a is 20") elseif( a ==30) then -- print("value of a is 30") else -- print("no match for a") end print("real value of a is: ", a ) The output of the above code is: no match for a real value of a is: 100 [ Lua Flow Control](#)