下表列出了所有的Lua语言支持的算术运算符。假设变量A持有10和变量B持有20，则：
[img]http://files.jb51.net/file_images/article/201505/2015527120458107.jpg?20154271259[/img]
[b] 例子[/b]
试试下面的例子就明白了所有的Lua编程语言提供了算术运算符：
a = 21
b = 10
c = a + b
print("Line 1 - Value of c is ", c )
c = a - b
print("Line 2 - Value of c is ", c )
c = a * b
print("Line 3 - Value of c is ", c )
c = a / b
print("Line 4 - Value of c is ", c )
c = a % b
print("Line 5 - Value of c is ", c )
c = a^2
print("Line 6 - Value of c is ", c )
c = -a
print("Line 7 - Value of c is ", c )
当执行上面的程序，它会产生以下结果：
Line 1 - Value of c is 31
Line 2 - Value of c is 11
Line 3 - Value of c is 210
Line 4 - Value of c is 2.1
Line 5 - Value of c is 1
Line 6 - Value of c is 441
Line 7 - Value of c is -21
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