Can anyone explains this to me ?

[MohammadAlshareef]

Can anyone explains how this code works ?
Why we put a condition in an array ? how is this ?
I cant understand this !?

  #include<iostream>
#include<string>
using namespace std;
int main()
{
    std::string TorF[] = {"False", "True"};
    int a = 100;
    int b = 33;
    int c = 33;
    
    cout<<"a < b is "<<TorF[a<b];
    cout<<"\na > b is "<<TorF[a>b];
    cout<<"\na != b is "<<TorF[a!=b];
    cout<<"\nc >= b is "<<TorF[c>=b];
    cout<<"\nc <= b is "<<TorF[c<=b];    
    return 0;
}

[salem c]

All the boolean operators yield a value 0 (for false) and 1 (for true).

These 0 or 1 values conveniently index your array of two elements.

It's as if you did
TorF[ a<b ? 1 : 0]

[E0p9LyTq]

All the boolean operators yield a value 0 (for false) and 1 (for true).

The built-in logical and comparison operators return bool (true or false). That can be convertible to and from a numeric value.

https://en.cppreference.com/w/cpp/language/operator_logical
https://en.cppreference.com/w/cpp/language/operator_comparison

[jonnin]

it is often faster in high performance code to have a little static array with your true and false results stored in it and to just type return (array[expression]) using this technique. if statements can (not always) cost you a bit more than necessary and this technique avoids the hit. The compiler is smart enough to do this exact thing FOR you MOST of the time when it optimizes, so you only have to do things this way once in a rare while if the compiler can't boil it down.