1. WIKI教程
2. 学习C＃
3. 嵌套if语句(nested if statements)

嵌套if语句(nested if statements)

nest if-else语句在C＃中始终是合法的，这意味着你可以在另一个if或else if语句中使用if或else if语句。

语法 (Syntax)

nested if语句的语法如下 -

if( boolean_expression 1) {
   /* Executes when the boolean expression 1 is true */
   if(boolean_expression 2) {
      /* Executes when the boolean expression 2 is true */
   }
}

您可以使用与嵌套if语句类似的方式嵌套if else if...else 。

例子 (Example)

using System;
namespace DecisionMaking {
   class Program {
      static void Main(string[] args) {
         //* local variable definition */
         int a = 100;
         int b = 200;
         /* check the boolean condition */
         if (a == 100) {
            /* if condition is true then check the following */
            if (b == 200) {
               /* if condition is true then print the following */
               Console.WriteLine("Value of a is 100 and b is 200");
            }
         }
         Console.WriteLine("Exact value of a is : {0}", a);
         Console.WriteLine("Exact value of b is : {0}", b);
         Console.ReadLine();
      }
   }
}

编译并执行上述代码时，会产生以下结果 -

Value of a is 100 and b is 200
Exact value of a is : 100
Exact value of b is : 200