下表列出了所有C#支持的关系运算符。假设变量A=10和变量B=20,则:
运算符 | 描述 | 示例 |
---|---|---|
== | 检查两个操作数的值是否相等,如果是的话那么条件为真 | (A == B) 结果不为 true. |
!= | 检查两个操作数的值是否相等,如果值不相等,则条件变为真 | (A != B) 结果为 true. |
> | 检查左边的操作数的值大于是否右操作数的值,如果是的话那么条件为真 | (A > B) 结果不为 true. |
< | 检查左边的操作数的值是否小于右操作数的值,如果是的话那么条件为真 | (A < B) 结果为 true. |
>= | 检查左边的操作数的值是否大于或等于右操作数的值,如果是的话那么条件为真 | (A >= B) 结果不为 true. |
<= | 检查左边的操作数的值是否小于或等于右操作数的值,如果是的话那么条件为真 | (A <= B) 结果为 true. |
例子
试试下面的例子就明白了所有的在C#中使用关系运算符:
using System; class Program { static void Main(string[] args) { int a = 21; int b = 10; if (a == b) { Console.WriteLine("Line 1 - a is equal to b"); } else { Console.WriteLine("Line 1 - a is not equal to b"); } if (a < b) { Console.WriteLine("Line 2 - a is less than b"); } else { Console.WriteLine("Line 2 - a is not less than b"); } if (a > b) { Console.WriteLine("Line 3 - a is greater than b"); } else { Console.WriteLine("Line 3 - a is not greater than b"); } /* Lets change value of a and b */ a = 5; b = 20; if (a <= b) { Console.WriteLine("Line 4 - a is either less than or equal to b"); } if (b >= a) { Console.WriteLine("Line 5-b is either greater than or equal to b"); } } }
让我们编译和运行上面的程序,这将产生以下结果:
Line 1 - a is not equal to b Line 2 - a is not less than b Line 3 - a is greater than b Line 4 - a is either less than or equal to b Line 5 - b is either greater than or equal to b