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How can I convert it? And I want the converted result to 1.

#include <iostream> #include <string> int main(int argc, const char * argv[]) { std::string s = "0x00"; // insert code here... unsigned char* str_hex = (unsigned char*)s.c_str(); unsigned char target = 0x00; std::cout << "result: " << (*str_hex == target) << "\n"; return 0; }
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1 Answer 1

Reset to default
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Like this: // #include <string>

std::string s = "0x4A"; unsigned char ch = std::stoul(s, nullptr, 16); // 'J' (Since C++11)

Or like this: // #include <cstdio>

std::string s = "0x4B"; unsigned char ch = '\0'; sscanf(s.c_str(), "%x", &ch); // 'K' (C library function)
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