Question

How to convert hex string to signed integer in C++

Answer 1

#include <sstream>
#include <iostream>

int main() {
    unsigned int n;   
    std::stringstream ss;
    
    ss << std::hex << "fff";
    ss >> n;
    
    std::cout << n;
}


/*
run:

4095

*/

 

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Answer 2

#include <iostream>

int main() {
    std::string str = "0xfff";
    
    // stoul (const std::string& str, std::size_t* pos = nullptr, int base = 10);
                           
    unsigned int n = std::stoul(str, nullptr, 16);
    
    std::cout << n;
}


/*
run:

4095

*/

 

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