c++ - Unexpected garbage value -

for reason getting unexpected garbage values on variable has assigned initialization.

#include <curses.h> #include <sys/time.h> #include <time.h> #include "fmttime.h"                    // include formattime interface #include <strstream> #include <iostream> #include <iomanip>  static int monthindex;                  // lookup table index static const int milli = 1000;          // constant value ms conversion static const int epochyear = 1970;      // epoch year 1970 static const int leapy = 4;             // number of years leapyear using namespace std;  struct monthpairs                       // fields month & day lookup table {     const char* mon;                    // months     int day;                            // days };  monthpairs months[] =                   // lookup table months & days {     {"jan", 31},     {"feb", 28},     {"mar", 31},     {"apr", 30},     {"may", 31},     {"jun", 30},     {"jul", 31},     {"aug", 31},     {"sep", 30},     {"oct", 31},     {"nov", 30},     {"dec", 31}, };  // structure contain human readable local // time values struct expandedtime {     int et_usec;        // number of milliseconds local time     int et_sec;         // number of seconds local time     int et_min;         // number of minutes local time     int et_hour;        // number of hours local time     int et_day;         // day of month local time     int et_mon;         // month of year local time     int et_year;        // our current year (2013 present) };  // function prototype expanded time function expandedtime* localtime(struct timeval* tv, expandedtime* etime);  // expanded time take epoch time , convert days, // months years, hours, minutes etc , store // expanded structure  expandedtime* localtime(                         struct timeval* tv,     // pointer timeval struct                         expandedtime* etime     // '' '' expandedtime strct                         ) {     tzset();                                    // corrects timezone      int epocht = (tv->tv_sec) - timezone;       // epoch seconds     int epochut = tv->tv_usec;                  // epochtime microseconds     int edays;                                  // days since epochtime     int days4years = 1460;                      // number of days in 4 years     int fouryears;                              // number of 4 year periods     int remaindays;                             // number of days leftover     int tempdays;                               // holds value of remaindays      int monthtracker = 0;                       // number of total months passed                                                 // since current 4 year period     int daysgoneby = 0;                         // number of days passed                                                 // since current 4 year period      etime->et_usec = (epochut/milli) % milli;   // find milliseconds     etime->et_sec = epocht % 60;     epocht /= 60;                               // turn minutes      etime->et_min = epocht % 60;     epocht /= 60;                               // turn hours      if (localtime(&tv->tv_sec)->tm_isdst !=0)         etime->et_hour = (epocht % 24) + 1;     // hours dst correction     else         etime->et_hour = (epocht % 24);      edays = tv->tv_sec / 86400;                 // turn days since epoch      fouryears = edays / days4years;     remaindays = edays % days4years;            // determines 4 year perio     tempdays = remaindays;      (monthindex = 0 ; tempdays >= 0 ; ++monthindex)     {         daysgoneby += months[monthindex].day;   // keeps track of days passed          tempdays -= months[monthindex].day;          if (monthindex >= 11)                   // resets counter 12 months         {             monthindex = 0;         }         ++monthtracker;     }      etime->et_day = monthindex; // (tempdays + months[monthindex].day);      // take number of months passed in current 4 year period     // , add epoch year of 1970 find current year      etime->et_year = (monthtracker / 12)  + (fouryears * 4) + epochyear;      return etime; }  // formats epoch time passed main function // human readable string char* formattime(                  struct timeval* tv,     // pointer timeval struct                  char* buf,              // pointer char buf                  size_t len              // size of buffer                  ) {     struct expandedtime etime2;         // struct object declaration      if (len > 0)                        // print valid sized buffer     {         localtime(tv, &etime2);         ostrstream oss(buf, len);          // prints time , date human readable string ,         // places in supplied buffer plot.cc          oss << etime2.et_year << " " <<  months[monthindex].mon << " " <<         etime2.et_day << " " << setw(2) << etime2.et_hour << ":"         << setfill('0') << setw(2) << etime2.et_min << ":" << setfill('0')         << setw(2) << etime2.et_sec << ":" << setfill('0') << setw(3) <<          etime2.et_usec << ends;     }      else if (len <= 0)     {         cout << "sorry length of buffer small cannot write" << en     }      return buf; } 

basically tempday evaluating large negative value -185338583 example. though assigned initial value of 1212, theres no reason tempdays in area of magnitude. im assuming must have done programs allocation of memory? cannot figure out.

i had code, changed loop while loop. changed exact same loop , thats when tempdays started act odd. assumption sort of garbage value being output tempdays....i have no clue why.