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   if and else

   Allows you to express conditional logic in your programs.

       if(expression())       /* if expression is true */
          statement();        /* perform statement     */

       if(expression())       /* if expression true    */
          statement();        /* perform statement     */
       else                   /* if NOT true           */
          statement();        /* perform this statement*/

       if(expression())       /* when more that one statement*/
       {
          statement1();
          statement2();
       }