不使用任何条件语句实现三元运算符-yiteyi-C++库

如何实施 C++中的三元算子不使用条件语句。在以下情况下： A.b:c 如果a为真，则b将被执行。否则，c将被执行。我们可以假设a、b和c为值。

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我们可以将方程编码为： 结果=（！！a）*b+（！a）*c 在上面的等式中，如果a为真，结果将为b。否则，结果将为c。

C++

                         // CPP code to implement ternary operator                       
                         #include <bits/stdc++.h>                       
           
                         // Function to implement ternary operator without                       
                         // conditional statements                       
                         int                                     ternaryOperator(                                     int                                     a,                                     int                                     b,                                     int                                     c)                       
                         {                       
                                                 // If a is true, we return (1 * b) + (!1 * c) i.e. b                       
                                                 // If a is false, we return (!1 * b) + (1 * c) i.e. c                       
                                                 return                                     ((!!a) * b + (!a) * c);                       
                         }                       
           
                         // Driver code                       
                         int                                     main()                       
                         {                       
                                                 int                                     a = 1, b = 10, c = 20;                       
                                   
                                                 // Function call to output b or c depending on a                       
                                                 std::cout << ternaryOperator(a, b, c) <<                                     ''                                     ;                       
           
                                                 a = 0;                       
                                   
                                                 // Function call to output b or c depending on a                       
                                                 std::cout << ternaryOperator(a, b, c);                       
                                   
                                                 return                                     0;                       
                         }                       

Python 3

                         # Python 3 code to implement ternary operator                       
           
                         # Function to implement ternary operator                       
                         # without conditional statements                       
                         def                                     ternaryOperator( a, b, c):                       
                                   
                                                 # If a is true, we return                       
                                                 # (1 * b) + (!1 * c) i.e. b                       
                                                 # If a is false, we return                       
                                                 # (!1 * b) + (1 * c) i.e. c                       
                                                 return                                     ((                                     not                                     not                                     a)                                     *                                     b                                     +                                     (                                     not                                     a)                                     *                                     c)                       
           
                         # Driver code                       
                         if                                     __name__                                     =                                     =                                     "__main__"                                     :                       
           
                                                 a                                     =                                     1                       
                                                 b                                     =                                     10                       
                                                 c                                     =                                     20                       
                                   
                                                 # Function call to output b or c                       
                                                 # depending on a                       
                                                 print                                     (ternaryOperator(a, b, c))                       
           
                                                 a                                     =                                     0                       
                                   
                                                 # Function call to output b or c                       
                                                 # depending on a                       
                                                 print                                     (ternaryOperator(a, b, c))                       
                                   
                         # This code is contributed by ita_c                       

PHP

                         <?php                       
                         // PHP code to implement                       
                         // ternary operator                       
           
                         // Function to implement                       
                         // ternary operator without                       
                         // conditional statements                       
                         function                                     ternaryOperator(                                     $a                                     ,                                     $b                                     ,                                     $c                                     )                       
                         {                       
                                   
                                                 // If a is true, we return                       
                                                 // (1 * b) + (!1 * c) i.e. b                       
                                                 // If a is false, we return                       
                                                 // (!1 * b) + (1 * c) i.e. c                       
                                                 return                                     ((!!                                     $a                                     ) *                                     $b                                     + (!                                     $a                                     ) *                                     $c                                     );                       
                         }                       
           
                                                 // Driver code                       
                                                 $a                                     = 1;                       
                                                 $b                                     = 10;                       
                                                 $c                                     = 20;                       
                                   
                                                 // Function call to output                       
                                                 // b or c depending on a                       
                                                 echo                                     ternaryOperator(                                     $a                                     ,                                     $b                                     ,                                     $c                                     ) ,                                     ""                                     ;                       
           
                                                 $a                                     = 0;                       
                                   
                                                 // Function call to output b                       
                                                 // or c depending on a                       
                                                 echo                                     ternaryOperator(                                     $a                                     ,                                     $b                                     ,                                     $c                                     );                       
                                   
                         // This code is contributed by jit_t.                       
                         ?>                       

Javascript

                         <script>                       
           
                         // Javascript code to implement                       
                         // ternary operator                       
                                   
                                                 // Function to implement                       
                                                 // ternary operator without                       
                                                 // conditional statements                       
                                                 function                                     ternaryOperator(a,b,c)                       
                                                 {                       
                                                 // If a is true,                       
                                                 // we return (1 * b) + (!1 * c) i.e. b                       
                                                 // If a is false,                       
                                                 // we return (!1 * b) + (1 * c) i.e. c                       
                                   
                                                 return                                     ((!!a) * b + (!a) * c);                       
                                                 }                       
                                   
                                                 // Driver code                       
                                                 let a = 1, b = 10, c = 20;                       
                                                 // Function call to output b or c depending on a                       
                                                 document.write( ternaryOperator(a, b, c)+                                     "<br>"                                     );                       
                                   
                                                 a = 0;                       
                                                 // Function call to output b or c depending on a                       
                                                 document.write( ternaryOperator(a, b, c)+                                     "<br>"                                     );                       
                                   
                                                 // This code is contributed by avanitrachhadiya2155                       
                                   
                         </script>                       

输出：

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