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  1. #include <iostream>
  2. #include <string>
  3. #include <iomanip>
  4.  
  5. int main()
  6. {    
  7.    std::string str = "0x12234";
  8.    unsigned long int var = std::stoul(str, nullptr, 16);
  9.    std::cout << "str = " << str << std::endl;
  10.    std::cout << "var = " << var << std::endl;
  11.    std::cout << "hex = " << std::hex << std::showbase << var << std::endl;
  12.    return 0;
  13. }
Success #stdin #stdout 0.01s 5512KB
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stdin
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Standard input is empty
stdout
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str = 0x12234
var = 74292
hex = 0x12234
https://ideone.com/ehfXwq
language:
C++ (gcc 8.3)
created:
3 years ago
visibility:
secret

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