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#include <iostream> #include <string> #include <sstream> using namespace std; string nice_number(long n) { bool negative = (n < 0 ) ? true : false; stringstream s; s << ((negative) ? -n : n); if( s.str().length() < 4 ){ stringstream s; s << n; return s.str(); } string number = ""; unsigned i = s.str().length(); while( i-- != 0 ){ if( (s.str().length() - i) % 3 == 0 && i != s.str().length()-1 ) number = string(",") + s.str().at(i) + number; else number = s.str().at(i) + number; } return (negative) ? string("-") + number : number; } int main( int argc, char **argv ) { cout << nice_number(-13123234) << endl; }
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