4.14. Lua if statement

Lua if statement consists of a Boolean expression as a conditional judgment, followed by other statements.

4.14.1. The syntax format of the Lua if statement is as follows: #

if(Booleans) then --[Statement executed when Boolean expression is true --] end 

When the Boolean expression is true at that time if block of code in is executed, when the Boolean expression is false , follow closelyat the if statement end , the subsequent code will be executed.

Lua believes that false and nil are false, while true and non nil are true. It should be noted that 0 in Lua is true .

The if statement flow chart is as follows:

Example #

The following example is used to determine a variable a is the value less than 20:

4.14.2. Example #

--[Define variables --] a = 10; --[ Using the if statement --] if( a < 20 ) then --[ Print the following information when the if condition is true --] print("A less than 20" ); end print("The value of a is:", a); 

The execution result of the above code is as follows:

A less than 20 The value of a is: 10 