Lua - 关系运算符
下表显示了 Lua 语言支持的所有关系运算符。 假设变量 A 持有 10 并且变量 B 持有 20 −
| 运算符 | 描述 | 示例 |
|---|---|---|
| == | 检查两个操作数的值是否相等，如果是则条件为真。 | (A == B) is not true. |
| ~= | 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) is true. |
| > | 检查左操作数的值是否大于右操作数的值，如果是则条件为真。 | (A > B) is not true. |
| < | 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) is true. |
| >= | 检查左操作数的值是否大于或等于右操作数的值，如果是则条件为真。 | (A >= B) is not true. |
| <= | 检查左操作数的值是否小于或等于右操作数的值，如果是则条件为真。 | (A <= B) is true. |
示例
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
