下表显示了Lua语言支持的所有关系运算符。 假设变量A=10，变量B=20，然后 -
| 运算符 | 描述 | 示例 |
|---|---|---|
== |
检查两个操作数的值是否相等，如果相等，则条件变为真。 | (A == B)结果为false |
~= |
检查两个操作数的值是否相等，如果值不相等则条件变为true。 |
(A ~= B)结果为true |
> |
检查左操作数的值是否大于右操作数的值，如果是，则条件变为true。 |
(A > B)结果为false |
< |
检查左操作数的值是否小于右操作数的值，如果是，则条件变为true。 |
(A < B)结果为true |
>= |
检查左操作数的值是否大于或等于右操作数的值，如果是，则条件变为true。 |
(A >= B)结果为false |
<= |
检查左操作数的值是否小于或等于右操作数的值，如果是，则条件变为true。 |
(A <= B)结果为true |
示例
尝试以下示例来了解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