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The All-in-One Guide to C++20

Solution: Analyze the Output

Explore the behavior of C++20 arithmetic utilities by analyzing output for numbers 0 to 15. Learn how to determine single bit set status, compute powers of two, count bits needed, and total set bits, providing deeper insight into bit manipulation and safe comparisons.

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Solution

C++
#include <bit>
#include <bitset>
#include <iostream>
 
int main() {
    std::cout << std::endl;
    
    std::cout << std::boolalpha;
    
    for (auto i = 0u; i < 16u; ++i) {
        std::cout << "has_single_bit(" << std::bitset<8>(i) << ") = " << std::has_single_bit(i) << '\n';
        std::cout << "bit_ceil(" << std::bitset<8>(i) << ") = " << std::bit_ceil(i) << '\n';
        std::cout << "bit_width(" << std::bitset<8>(i) << ") = " << std::bit_width(i) << '\n';
        std::cout << "bit_popcount(" << std::bitset<8>(i) << ") = " << std::popcount(i) << '\n';   
        
        std::cout << std::endl;
    }
    std::cout << std::endl; 
}

Explanation

The loop runs for all numbers from 0u ...