Example: Binary to Septenary Converter in C++

// Binary to Septenary Converter
#include <iostream>
#include <string>
#include <algorithm> // Required for std::reverse

// Function to convert binary to decimal
long long binaryToDecimal(long long binaryNumber) {
    long long decimalNumber = 0;
    long long base = 1; // Represents powers of 2 (2^0, 2^1, 2^2, ...)

    while (binaryNumber > 0) {
        int lastDigit = binaryNumber % 10; // Get the last digit (either 0 or 1)
        binaryNumber = binaryNumber / 10;  // Remove the last digit
        decimalNumber += lastDigit * base; // Add the product of digit and power of 2
        base *= 2;                         // Move to the next power of 2
    }
    return decimalNumber;
}

// Function to convert decimal to septenary
long long decimalToSeptenary(long long decimalNumber) {
    if (decimalNumber == 0) {
        return 0; // Special case for input 0
    }

    std::string septenaryString = "";
    while (decimalNumber > 0) {
        int remainder = decimalNumber % 7; // Get the remainder when divided by 7
        septenaryString += std::to_string(remainder); // Append remainder to string
        decimalNumber /= 7;                          // Update decimal number
    }
    std::reverse(septenaryString.begin(), septenaryString.end()); // Reverse the string
    return std::stoll(septenaryString); // Convert string back to long long
}

int main() {
    // Step 1: Declare a variable to store the binary input
    long long binaryInput;

    // Step 2: Prompt the user to enter a binary number
    std::cout << "Enter a binary number: ";
    std::cin >> binaryInput;

    // Step 3: Convert the binary number to its decimal equivalent
    long long decimalValue = binaryToDecimal(binaryInput);

    // Step 4: Convert the decimal value to its septenary equivalent
    long long septenaryValue = decimalToSeptenary(decimalValue);

    // Step 5: Display the result
    std::cout << "Binary " << binaryInput << " = Septenary " << septenaryValue << std::endl;

    return 0;
}