Walid

[TUT] Lua Operators

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Hello everybody Today in this tutorial i will explain to you the arithmetic, relational, and logical operators one by one. it's easy just try to follow my tutorial step by step .

 

Arithmetic Operators: `+´ , `-´ , `*´ , `/´ , `-´ , `^´
Relational Operators : `<´ , `>´ , `<=´ , `>=´ , `==´ , `~=´
Logical Operators: `and´, `or´, `not´
Misc Operators: `..´, `#

 

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Following table shows all the arithmetic operators supported by Lua language.

 

Description:

Operator

`+´ (addition) : Adds two operands Ex: 1 + 5 = 6
`-´ (subtraction): Subtracts second operand from the first Ex: 10-30 = -20
`*´ (multiplication): Multiply both operands Ex: 5 * 3 = 15
`/´ (division): Divide numerator by de-numerator Ex: 8 / 2 = 4
`^´ (exponentiation): Exponent Operator takes the exponents Ex: 5 ^ 2 = 25

 

Examples:


local W = 5 
local M = 10 
  
outputChatBox(W + M) -- Addition: 15 
outputChatBox(W - M) -- Subtraction: -5 
outputChatBox(W * M) -- Multiplication: 50 
outputChatBox(W / M) -- Division: 0.5 
outputChatBox(W^2) -- Exponentiation: 25 
 

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Relational operators are supplied which return the boolean values true or false.

 

Description:

Operator

`==´ (equal to) : Example (5 == 6) false
`~=´ (not equal to) : Example (5 ~= 6) true
`<´ (less than) : Example (5 < 6 ) true
`>´ (greater than) : Example (5 > 6 ) false
`<=´ (less than or equal to) : Example (5 <= 6 ) true
`>=´(greater than or equal to) : Example (5 >= 6 ) false

 

Example:


local W = 5 
local M = 10 
  
-- Example 1 : == Equal to 
if( W == M ) then 
   outputChatBox(W.." is equal to "..M ) 
else 
   outputChatBox(W.." is not equal to "..M ) 
end 
  
-- Example 2 : ~= Not equal to 
if( W ~= M ) then 
   outputChatBox(W.." is not equal to "..M ) 
else 
   outputChatBox(W.." is equal to "..M ) 
end 
  
-- Example 3 : < less than 
if ( W < M ) then 
   outputChatBox(W.." is less than "..M ) 
else 
   outputChatBox(W.." is not less than "..M ) 
end 
  
-- Example 4 : Greater than 
if ( W > M ) then 
   outputChatBox(W.." is greater than "..M) 
else 
   outputChatBox(W.." is not greater than "..M ) 
end 
  
-- Example 5 : <= less than or equal to 
if ( W <= M ) then 
   outputChatBox(W.."is either less than or equal to "..M ) 
end 
  
-- Example 6 : >= greater than or equal to 
if ( M >= W )  
   outputChatBox(M.." is either greater than  or equal to "..W ) 
end 
 

 

Note: These also work on strings (alphabetical order) and other types.

 

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Following table shows all the logical operators supported by Lua language

 

Description:

Operator

`and´: (Called Logical AND operator) Example:(true and false) is false
`or´: (Called Logical OR Operator) Example:(true or false) is true
`not´: (Called Logical NOT Operator) Example: (not true) is false

 

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Also there is Miscellaneous operators supported by Lua Language include concatenation and length.

 

Description:

`..´ : Concatenates two strings.

`#´ : An unary operator that return the length of the a string or a table.

 

Examples:


local W = "Hello" 
local M = "Everybody" 
  
-- Example 1 : Concatenates two strings. 
outputChatBox(W.." "..M) -- Result: Hello Everybody 
  
-- Example 2:  
outputChatBox(#W) -- Result: 5 
 
Edited by Walid
  • Like 2
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Good tutorial, but you should add in the "..." operator too.
Great Job, This topic is really very useful for people who just started scripting.

Thx guys.

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Awesome TuT, helpful like always @Walid ;)

Thx hope it helps.

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Thx hope it helps.

Yep it does,i will share it with my friends some of them need to learn the LUA operators,im sure this will helps them its clear and understandable to newbies,thanks for your works.

Edited by Guest

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Cool work dude !

Can you add the string and math functions as well? I would really be nice.

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Cool work dude !

Can you add the string and math functions as well? I would really be nice.

Maybe i will add an other TUT.

thx.

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Cool work dude !

Can you add the string and math functions as well? I would really be nice.

Maybe i will add an other TUT.

thx.

Thank you dude

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There won't be space between Hello and Everybody on example 1 result.

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There won't be space between Hello and Everybody on example 1 result.

Yeh bro it's just an example of how to concatenates two strings.

outputChatBox(W.. "  "..M) -- Result: Hello Everybody. 

anyways thx.

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