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D语言if...else if...else语句

import std.stdio;

int main () { 
   /* local variable deFinition */ 
   int a = 100; 

   /* check the boolean condition */ 
   if( a == 10 ) { 
      /* if condition is true then print the following */ 
      writefln(Value of a is 10 ); 
   } else if( a == 20 ) { 
      /* if else if condition is true */ 
      writefln(Value of a is 20 ); 
   } else if( a == 30 ) { 
      /* if else if condition is true  */ 
      writefln(Value of a is 30 ); 
   } else { 
      /* if none of the conditions is true */ 
      writefln(None of the values is matching ); 
   } 
   writefln(Exact value of a is: %d, a ); 

   return 0; 
}

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