Example: Binary to Decimal using std::bitset in C++

C
C++
C#
Java
Python
PHP
// Binary to Decimal using std::bitset
#include <iostream>
#include <string>   // Required for std::string
#include <bitset>   // Required for std::bitset

int main() {
    std::string binaryString;
    std::cout << "Enter a binary string: ";
    std::cin >> binaryString;

    // Step 1: Create a bitset from the binary string
    // The template parameter specifies the maximum number of bits
    // Ensure it's large enough for your expected binary numbers.
    // For example, 64 bits for unsigned long long.
    try {
        std::bitset<64> bits(binaryString); // Max 64 bits

        // Step 2: Convert the bitset to an unsigned long long
        unsigned long long decimalNumber = bits.to_ullong();

        std::cout << "Decimal equivalent: " << decimalNumber << std::endl;
    } catch (const std::invalid_argument& e) {
        std::cerr << "Error: Invalid binary string entered. " << e.what() << std::endl;
    }

    return 0;
}