D Programming - Nested if Statement

It is always legal in D programming to nest if-else statements, which means you can use one if or else if statement inside another if or else if statement(s).

Syntax

The syntax for a nested if statement is as follows −

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

You can nest else if...else in the similar way as you have nested if statement.

Example

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; 
}

When the above code is compiled and executed, it produces the following result −

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