How to convert string to double dollars using C++ string stream, a STL container, and locale

(Last Updated On: May 18, 2010)
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How to convert string to double dollars using C++ string stream, STL containers, and locale


using namespace std;

void to_dollar(int a);

int my_number_format(int num)
int idx;
char buffer[64];

idx = sizeof(buffer)-1;
buffer[idx–] = 0; // end zero

int count = 0;
while (num > 0) {
if (0 == idx)
return -1;
if (count > 2) {
buffer[idx–] = ‘,’;
if (0 == idx)
return -1;
count = 0;
buffer[idx–] = ‘0’+(num % 10);
num /= 10;

buffer[idx] = ‘$’; // currency sign
return printf(“%s\n”, &buffer[idx]);

int main()
int userInput;

cout << "Please enter an integer-:> ” << endl; cin >> userInput;
int result;
return (0);

void to_dollar(int a)
stringstream inString;
string strTemp;
long double intTemp;

inString << a; // convert integer to string for easier handling inString.str(inString.str()+"00"); // concatenate two zeos to denote currency fractional digits inString >> intTemp; // convert back to integer

locale loc(“english_USA”); // set the locale

cout.setf(cout.flags() | ios::showbase); // turn on currency sign printing
const money_put& m_put = use_facet >(loc); // get the money_put facet
m_put.put(cout, false, cout, ‘ ‘, intTemp); // show me the money. Note to use fractionally adjusted value.
cout << endl; }


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Hi i there My name is Bryan Downing. I am part of a company called QuantLabs.Net This is specifically a company with a high profile blog about technology, trading, financial, investment, quant, etc. It posts things on how to do job interviews with large companies like Morgan Stanley, Bloomberg, Citibank, and IBM. It also posts different unique tips and tricks on Java, C++, or C programming. It posts about different techniques in learning about Matlab and building models or strategies. There is a lot here if you are into venturing into the financial world like quant or technical analysis. It also discusses the future generation of trading and programming Specialties: C++, Java, C#, Matlab, quant, models, strategies, technical analysis, linux, windows P.S. I have been known to be the worst typist. Do not be offended by it as I like to bang stuff out and put priorty of what I do over typing. Maybe one day I can get a full time copy editor to help out. Do note I prefer videos as they are much easier to produce so check out my many video at