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#include <iostream>
using namespace std;
 
int main() {
	string sCurrentTime;
       time_t ltime;
      struct tm *newtime;
      char locTime[8 + 1];
      time(&ltime);
      newtime = localtime(&ltime);
      sprintf(locTime, "%04d%02d%02d", newtime->tm_year+1900, newtime->tm_mon+1, newtime->tm_mday); // YYYYMMDD
      sCurrentTime = locTime;
 
  std::string yydd = "5056";
  unsigned short day = 0;
  unsigned short month = 1;
  unsigned short days_in_month[12] = {31, (unsigned short)((stoi(sCurrentTime.substr(0, 3) + yddd[0]) % 4) == 0 ? 29 : 28), 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
 
  for (int i=0; i<12; i++) {
    if (day - days_in_month[i] <= 0) {
      break;
    } else {
      month++;
      day -= days_in_month[i];
    }
  }
  string yyyymmdd = sCurrentTime.substr(0,3) + yddd[0] + ((month < 10) ? "0" + toString<unsigned short>(month) : toString<unsigned short>(month)) + ((day < 10) ? "0" + toString<unsigned short>(day) : toString<unsigned short>(day));
 
  std::cout << yyyymmdd;
}

prog.cpp: In function 'int main()':
prog.cpp:11:98: error: 'sprintf' was not declared in this scope
       sprintf(locTime, "%04d%02d%02d", newtime->tm_year+1900, newtime->tm_mon+1, newtime->tm_mday); // YYYYMMDD
                                                                                                  ^
prog.cpp:17:94: error: 'yddd' was not declared in this scope
   unsigned short days_in_month[12] = {31, (unsigned short)((stoi(sCurrentTime.substr(0, 3) + yddd[0]) % 4) == 0 ? 29 : 28), 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
                                                                                              ^
prog.cpp:17:101: error: 'stoi' was not declared in this scope
   unsigned short days_in_month[12] = {31, (unsigned short)((stoi(sCurrentTime.substr(0, 3) + yddd[0]) % 4) == 0 ? 29 : 28), 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
                                                                                                     ^
prog.cpp:27:80: error: 'toString' was not declared in this scope
   string yyyymmdd = sCurrentTime.substr(0,3) + yddd[0] + ((month < 10) ? "0" + toString<unsigned short>(month) : toString<unsigned short>(month)) + ((day < 10) ? "0" + toString<unsigned short>(day) : toString<unsigned short>(day));
                                                                                ^
prog.cpp:27:89: error: expected primary-expression before 'unsigned'
   string yyyymmdd = sCurrentTime.substr(0,3) + yddd[0] + ((month < 10) ? "0" + toString<unsigned short>(month) : toString<unsigned short>(month)) + ((day < 10) ? "0" + toString<unsigned short>(day) : toString<unsigned short>(day));
                                                                                         ^
prog.cpp:27:89: error: expected ':' before 'unsigned'
prog.cpp:27:89: error: expected primary-expression before 'unsigned'
prog.cpp:27:89: error: expected ')' before 'unsigned'

Standard output is empty