How to return a hex value after converting it from a string

Question

I am trying to return a hex value inside this method. not sure where I'm going wrong. not sure how put the value into hex without using cout. have not been able to find a solution. Input value is always going to be 32 bits long

its like i want to return hex << x but thats not an option.

string StringToHex (myInstruction* RealList, int Pos)
{
    string result = "11111111110000000000110011001100";
    unsigned long x = strtoul(result.c_str(), &pEnd, 2);
    cout<< hex << x<<endl;
    return  x;
}

score 1 · Accepted Answer · answered Oct 03 '13 at 17:27

You can use a stringstream instead of cout.

cout is just one special ostream that is created by default and is hooked up to the program's standard output. You can create other ostream objects that write to different things. std::stringstream writes to a std::string inside it.

#include <sstream>

std::string to_hex() {
  unsigned int x = 256;

  std::stringstream s;
  s << std::hex << x;
  return s.str();
}

score 0 · Answer 2 · answered Oct 03 '13 at 17:28

0

Use std::stringstream

std::stringstream ss;
ss<< std::hex << x;
std::string res= ss.str();

answered Oct 03 '13 at 17:28

P0W

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score 0 · Answer 3 · answered Oct 03 '13 at 17:37

If I understand your questinon, you want to return a hex value as a string, rigt? If so, then:

std::string intToHexStr (int val)
{
    std::stringstream sstr;
    sstr << hex << val;
    std::string result;
    sstr >> result;
    return result;
}

Hope this helps!

How to return a hex value after converting it from a string

3 Answers3