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created by

anonymous

41 seconds ago

​x
 
#include <iostream>
#include <string>
#include <sstream>
#include <iostream>
#include <iomanip>
​
#include <vector>
#include <cstdint>
​
std::vector<uint8_t> hex_decode(std::string input){
  std::vector<uint8_t> output;
​
  for (int i = 0; i < input.length(); i+=2) {
    output.push_back(0);
  }
  
  for (int i = 0; i < input.length(); i+=2) {
    uint8_t n = 0;
    std::stringstream ss;
    ss << input[i];
    ss >> std::hex >> n;
    n = n <<4;
    output[i/2] += n;
    ss >> std::hex >> n;
    output[i/2] += n;
  }
}
​
​
int main(int argc, char** argv) {
  std::string input;
  std::vector<uint8_t> decode;
  std::cin >> input;
​
  decode = hex_decode(input);
  for (auto&& b : decode) {
    std::cout << b;
  }
}

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$ g++ prog.cc -Wall -Wextra -std=c++2a

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prog.cc: In function 'std::vector<unsigned char> hex_decode(std::string)':
prog.cc:13:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   13 |   for (int i = 0; i < input.length(); i+=2) {
      |                   ~~^~~~~~~~~~~~~~~~
prog.cc:17:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   17 |   for (int i = 0; i < input.length(); i+=2) {
      |                   ~~^~~~~~~~~~~~~~~~
prog.cc:27:1: warning: no return statement in function returning non-void [-Wreturn-type]
   27 | }
      | ^
prog.cc: In function 'int main(int, char**)':
prog.cc:30:14: warning: unused parameter 'argc' [-Wunused-parameter]
   30 | int main(int argc, char** argv) {
      |          ~~~~^~~~
prog.cc:30:27: warning: unused parameter 'argv' [-Wunused-parameter]
   30 | int main(int argc, char** argv) {
      |                    ~~~~~~~^~~~

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