D語言if嵌套語句

它始終是合法的，在D編程嵌套if-else語句，這意味着你可以使用一個if或else if語句在另一個if或else if語句。

語法

嵌套的if語句的語法如下：

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 以類似的方式，如嵌套的if語句。

例子：

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; }

當上面的代碼被編譯並執行，它會產生以下結果：

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