Decimal to hex conversion c++ built-in function

Decimal to hex :-

std::stringstream ss;
ss<< std::hex << decimal_value; // int decimal_value
std::string res ( ss.str() );

std::cout << res;

Hex to decimal :-

std::stringstream ss;
ss  << hex_value ; // std::string hex_value
ss >> std::hex >> decimal_value ; //int decimal_value

std::cout << decimal_value ;

Ref: std::hex, std::stringstream

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