无涯教程-C# - if 语句函数

if语句由一个布尔表达式后跟一个或多个语句组成。

if statement - 语法

C#中IF语句的语法是-

if(boolean_expression) {
   /* statement(s) will execute if the boolean expression is true */
}

if statement - 流程图

using System;
namespace DecisionMaking {
class Program {
static void Main(string[] args) {
/* 局部变量定义 */
int a = 10;
     </span><span class="com">/* 使用 if 语句检查布尔条件 */</span><span class="pln">
     </span><span class="kwd">if</span><span class="pln"> </span><span class="pun">(</span><span class="pln">a </span><span class="pun">&lt;</span><span class="pln"> </span><span class="lit">20</span><span class="pun">)</span><span class="pln"> </span><span class="pun">{</span><span class="pln">
        </span><span class="com">/* 如果条件为真，则打印以下内容 */</span><span class="pln">
        </span><span class="typ">Console</span><span class="pun">.</span><span class="typ">WriteLine</span><span class="pun">(</span><span class="str">"a is less than 20"</span><span class="pun">);</span><span class="pln">
     </span><span class="pun">}</span><span class="pln">
     </span><span class="typ">Console</span><span class="pun">.</span><span class="typ">WriteLine</span><span class="pun">(</span><span class="str">"value of a is : {0}"</span><span class="pun">,</span><span class="pln"> a</span><span class="pun">);</span><span class="pln">
     </span><span class="typ">Console</span><span class="pun">.</span><span class="typ">ReadLine</span><span class="pun">();</span><span class="pln">
  </span><span class="pun">}</span><span class="pln">

}
}

编译并执行上述代码时，将生成以下输出-

a is less than 20;
value of a is : 10

参考链接

www.learnfk.com/csharp/if-s…