它始終是合法的，在D編程嵌套if-else語(yǔ)句，這意味著你可以使用一個(gè)if或else if語(yǔ)句在另一個(gè)if或else if語(yǔ)句。
嵌套的if語(yǔ)句的語(yǔ)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(yǔ)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; }
當(dāng)上面的代碼被編譯并執(zhí)行，它會(huì)產(chǎn)生以下結(jié)果：
Value of a is 100 and b is 200 Exact value of a is : 100 Exact value of b is : 200
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