Lua - 关系运算符

简述

下表显示了 Lua 语言支持的所有关系运算符。假设变量A 容纳 10 和变量 B 持有 20 然后 -

操作符	描述	例子
==	检查两个操作数的值是否相等，如果是，则条件为真。	(A == B) 不为真。
~=	检查两个操作数的值是否相等，如果值不相等则条件为真。	(A ~= B) 为真。
>	检查左操作数的值是否大于右操作数的值，如果是，则条件为真。	(A > B) 为假。
<	检查左操作数的值是否小于右操作数的值，如果是，则条件为真。	(A < B) 为真。
>=	检查左操作数的值是否大于或等于右操作数的值，如果是，则条件为真。	(A >= B) 不为真。
<=	检查左操作数的值是否小于或等于右操作数的值，如果是则条件成立。	(A <= B) 为真。

例子

尝试以下示例以了解 Lua 编程语言中可用的所有关系运算符 -


a = 21
b = 10
if( a == b )
then
   print("Line 1 - a is equal to b" )
else
   print("Line 1 - a is not equal to b" )
end
if( a ~= b )
then
   print("Line 2 - a is not equal to b" )
else
   print("Line 2 - a is equal to b" )
end
if ( a < b )
then
   print("Line 3 - a is less than b" )
else
   print("Line 3 - a is not less than b" )
end
if ( a > b ) 
then
   print("Line 4 - a is greater than b" )
else
   print("Line 5 - a is not greater than b" )
end
-- Lets change value of a and b
a = 5
b = 20
if ( a <= b ) 
then
   print("Line 5 - a is either less than or equal to  b" )
end
if ( b >= a ) 
then
   print("Line 6 - b is either greater than  or equal to b" )
end

当您构建并执行上述程序时，它会产生以下结果 -


Line 1 - a is not equal to b
Line 2 - a is not equal to b
Line 3 - a is not less than b
Line 4 - a is greater than b
Line 5 - a is either less than or equal to  b
Line 6 - b is either greater than  or equal to b