#include <iostream>
#include <string>
#include <sstream>
#include <stdexcept>

namespace BitcoinUtils {

    /**
    * @class BitcoinAddressConverter
    * Converts a Bitcoin address to a hexadecimal private key within a specified range.
    */
    class BitcoinAddressConverter {
    private:
        /**
        * Converts a hexadecimal string to an integer.
        *
        * @param hexString The hexadecimal string to convert.
        * @return uint64_t The converted integer value.
        * @throws std::invalid_argument if the input string is not a valid hexadecimal number.
        */
        uint64_t hexStringToInteger(const std::string& hexString) {
            std::stringstream ss;
            ss << std::hex << hexString;
            uint64_t result;
            ss >> result;

            if (ss.fail()) {
                throw std::invalid_argument("Invalid hexadecimal string.");
            }

            return result;
        }

    public:
        /**
        * Converts a Bitcoin address to a hexadecimal private key within a specified range.
        *
        * @param btcAddress The Bitcoin address to convert.
        * @param minPrivateKey The minimum value of the hexadecimal private key range.
        * @param maxPrivateKey The maximum value of the hexadecimal private key range.
        * @return std::string The hexadecimal private key.
        * @throws std::invalid_argument if the Bitcoin address is not valid or the range is invalid.
        */
        std::string convertToPrivateKey(const std::string& btcAddress, uint64_t minPrivateKey, uint64_t maxPrivateKey) {
            // Validate the range
            if (minPrivateKey > maxPrivateKey) {
                throw std::invalid_argument("Invalid range: minPrivateKey should be less than or equal to maxPrivateKey.");
            }

            // Convert the Bitcoin address to an integer
            uint64_t btcAddressInteger = hexStringToInteger(btcAddress);

            // Check if the Bitcoin address is within the specified range
            if (btcAddressInteger < minPrivateKey || btcAddressInteger > maxPrivateKey) {
                throw std::invalid_argument("Bitcoin address is not within the specified range.");
            }

            // Convert the Bitcoin address to a hexadecimal private key
            std::stringstream ss;
            ss << std::hex << btcAddressInteger;
            std::string privateKey = ss.str();

            return privateKey;
        }
    };
}

int main() {
    std::string btcAddress = "13zb1hQbWVsc2S7ZTZnP2G4undNNpdh5so";
    uint64_t minPrivateKey = 0x20000000000000000;
    uint64_t maxPrivateKey = 0x3ffffffffffffffff;

    BitcoinUtils::BitcoinAddressConverter converter;
    try {
        std::string privateKey = converter.convertToPrivateKey(btcAddress, minPrivateKey, maxPrivateKey);
        std::cout << "Private Key: " << privateKey << std::endl;
    }
    catch (const std::exception& e) {
        std::cerr << "Error: " << e.what() << std::endl;
    }

    return 0;
} 

C++ Online Compiler

Write, Run & Share C++ code online using OneCompiler's C++ online compiler for free. It's one of the robust, feature-rich online compilers for C++ language, running on the latest version 17. Getting started with the OneCompiler's C++ compiler is simple and pretty fast. The editor shows sample boilerplate code when you choose language as C++ and start coding!

Read inputs from stdin

OneCompiler's C++ online compiler supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample program which takes name as input and print your name with hello.

#include <iostream>
#include <string>
using namespace std;

int main() 
{
    string name;
    cout << "Enter name:";
    getline (cin, name);
    cout << "Hello " << name;
    return 0;
}

About C++

C++ is a widely used middle-level programming language.

  • Supports different platforms like Windows, various Linux flavours, MacOS etc
  • C++ supports OOPS concepts like Inheritance, Polymorphism, Encapsulation and Abstraction.
  • Case-sensitive
  • C++ is a compiler based language
  • C++ supports structured programming language
  • C++ provides alot of inbuilt functions and also supports dynamic memory allocation.
  • Like C, C++ also allows you to play with memory using Pointers.

Syntax help

Loops

1. If-Else:

When ever you want to perform a set of operations based on a condition If-Else is used.

if(conditional-expression) {
   //code
}
else {
   //code
}

You can also use if-else for nested Ifs and If-Else-If ladder when multiple conditions are to be performed on a single variable.

2. Switch:

Switch is an alternative to If-Else-If ladder.

switch(conditional-expression){    
case value1:    
 // code    
 break;  // optional  
case value2:    
 // code    
 break;  // optional  
......    
    
default:     
 code to be executed when all the above cases are not matched;    
} 

3. For:

For loop is used to iterate a set of statements based on a condition.

for(Initialization; Condition; Increment/decrement){  
  //code  
} 

4. While:

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

while (condition) {  
// code 
}  

5. Do-While:

Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.

do {  
 // code 
} while (condition); 

Functions

Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity. Function gets run only when it is called.

How to declare a Function:

return_type function_name(parameters);

How to call a Function:

function_name (parameters)

How to define a Function:

return_type function_name(parameters) {  
 // code
}