#include <iostream> #include <sstream> #include <iomanip> std::string decToHex(int decimal) { std::stringstream ss; ss << std::hex << decimal; return ss.str(); } int main() { int decimalNumber = 123456789; std::string hexString = decToHex(decimalNumber); std::cout << "十六进制表示: " << hexString << std::endl; return 0; }