发布于 2015-08-16 14:50:24 | 101 次阅读 | 评论: 0 | 来源: 网络整理
它始终是合法的，在D编程嵌套if-else语句，这意味着你可以使用一个if或else if语句在另一个if或else if语句。
嵌套的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 */
}
}
可以嵌套else if...else 以类似的方式，如嵌套的if语句。
import std.stdio;
int main ()
{
/* 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 */
writefln("Value of a is 100 and b is 200" );
}
}
writefln("Exact value of a is : %d", a );
writefln("Exact value of b is : %d", b );
return 0;
}
当上面的代码被编译并执行，它会产生以下结果：
Value of a is 100 and b is 200
Exact value of a is : 100
Exact value of b is : 200