在没有任何条件声明的情况下实现三元运算符

如何在不使用条件语句的情况下在C++中实现三元运算符。
在下面的条件：一个? b：c
如果a为true，则将执行b。
否则，将执行c。
我们可以假设a，b和c为值。

我们可以将等式编码为：
结果=(!! a)* b +(！a)* c
在上式中，如果a为true，则结果为b。
否则，结果将为c。

C++

// CPP code to implement ternary operator
#include 
 
// 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) << '\n';
 
    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

Javascript

 
// 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
     

输出：

10
20

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