Question
Below is a C++ Date Class being run on Code Blocks 13.12. The code was corrected in large part by a Chegg expert last week.
Below is a C++ Date Class being run on Code Blocks 13.12. The code was corrected in large part by a Chegg expert last week. However, I am still getting the error code:
undefined reference to Date::Date()
undefined reference to operator
There are three Date files, main.cpp, DATE.H, and DATE.CPP below.
// main.cpp
// Header Files #include "Date.h" // Contain Function declarations or prototypes #include
using namespace std; // Contains C++ libraries
// Start of main int main() {
Date today; // Data Class object
// Display today date cout
// Pause the system for a while system("pause");
return 0; // Return integer if no errors }// End of main
// DATE.H
//Date.h
#ifndef Date_H #define Date_H #include
using namespace std;
class Date {
private: int month, day, year; int days[13]; public: //constructors Date(); //constructor for todays date Date(int m, int d, int y); //constructor to assign date Date(string str); //constructor for todays date as "mm/dd/year Date(int gregorian); //constructor to convert a Gregorian date to Date
//methods int getMonth() const; //returns the private variable month int getDay() const; //returns the private variable day int getYear() const; //returns the private variable year string toString() const; //returns the string mm/dd/yyyy bool leapYear() const; //determines if the year is a leap year int dayofYear() const; //returns the day of the year: ie 2/1/???? is the 32 day of year int julian() const; int weekday() const; //returns 0 for Sunday, 1 for Monday, etc.
//overloaded operators bool operator==(const Date& otherDate); //2 dates are equal if month, day and year are equal bool operator(const Date& otherDate); //a date is > another date if it is later Date operator=(const Date& otherDate); //let's you copy one date to another. Date operator+(int); //Assign new values to the date after adding the number of days friend ostream& operator > (istream &input, Date &d); };
bool validDate(int m, int d, int y); //test other date bool leapYear(int y); //let's you test any year, not just the year for the instance int julian(int m, int d, int y); //convert any date to Julian void gregorian(int jd, int &mth, int &d, int &y); static int days2[]={0,31,28,31,30,31,30,31,31,30,31,30,31}; #endif
//Date.cpp
#include "Date.h" #include
Date::Date() {
//constructor to assign todays date to date
char data[9]; //holder for the date
_strdate(data); //gets the current date mm/dd/yy
string date(data); //copy to a string for parsing
if(date[0]=='0') month = stoi(date.substr(1,1)); else month = stoi(date.substr(0,2)); //gets characters 0 and 1 of date and converts to int
if(date[3]=='0') day = stoi(date.substr(4,1)); else day = stoi(date.substr(3,2)); //day=stoi(date.substr(3,2)); //gets characters 3 and 4 of date and converts to int
year=stoi(date.substr(6,2))+2000; //gets characters 6 and 7 of date and converts to int
if(leapYear()) days2[2]=29; else days2[2]=28;
for(int m=0;m
}//constructor for today
bool validDate(int m, int d, int y) {
bool valid=true; //assume it is valid until found to be invalid
if(y
if(m12) valid=false;
if(leapYear(y)) days2[2]=29; else days2[2]=28;
if(ddays2[m]) valid=false;
return valid;
}//validDate
Date::Date(int m, int d, int y) {
//constructor to assign values to month day and year
if(validDate(m,d,y)) {
month=m;
day=d;
year=y;
}
else {
month=day=1;
year=1970; //Unix time starting point
} /ot valid: set to default valid date
for(int m=0;m
} //constructor with assigned values
Date::Date(int julian) {
//Fliegel-Van Flandern algorithm to convert Julian date to Gregorian number month, day, and year
gregorian(julian,month,day,year);
if(leapYear()) days2[2]=29; else days2[2]=28;
for(int m=0;m
}//Date Julian
Date::Date (string str) { //constructor for todays date as "mm/dd/year
//Parse str by adding one char at a s time to the token until a "/" is encounter.
//When "/" is encountered start the next token
//int p=0;
int count=0;
int num[3];
string token[3];
int len=str.length();
for(int p=0; p if(str.substr(p,1)=="/") count++; else token[count]+=str.substr(p,1); }//parse str to create array of tokens bool error=false; for(int p=0;p try { num[p]=stoi(token[p]); }//try to convert to int catch(invalid_argument&) { num[p]=-1; error=true; } //catch }//each of the 3 tokens if(!error && validDate(num[0],num[1],num[2])) { month=num[0]; day=num[1]; year=num[2]; } /o error else { month=day=1; year=1970; //Unix time starting point } /ot valid: set to default valid date for(int m=0;m }//constructor with string such as "10/31/2016" Date Date::operator=(const Date& otherDate) { //assigns another instance of the date class to this. month=otherDate.month; day=otherDate.day; year=otherDate.year; return *this; //allows date1=date=date3; }//overloaded operator = Date Date::operator+(int numDays) { //Adds the number of days to the Julian date. Date other(month,day,year); //make copy of the date int jd=other.julian(); //find the Julian date jd+=numDays; //add the number of days to the Julian date gregorian(jd,other.month,other.day,other.year); //Convert the Julian date back to Gregorian if(other.leapYear()) days2[2]=29; else days2[2]=28; for(int m=0;m return other; } //operator + int Date::dayofYear() const { //returns the day of the year, ie 2/1/???? is the 32 day of the year int total=day; for(int m=1;m return total; }//dayofYear void gregorian(int julian, int &mth, int &d, int &y) { //Fliegel-Van Flandern algorithm to convert Julian date to Gregorian month, day, and year int p,q,r,s,t,u,v; p = julian + 68569; q = 4*p/146097; r = p - (146097*q + 3)/4; s = 4000*(r+1)/1461001; t = r - 1461*s/4 + 31; u = 80*t/2447; v = u/11; y = 100*(q-49)+s+v; mth = u + 2 - 12*v; d = t - 2447*u/80; } //Gregorian int Date::julian() const { int jd= day-32075+1461*(year+4800+(month-14)/12)/4+ 367*(month-2-(month-14)/12*12) /12-3*((year+4900+(month-14)/12)/100)/4; return jd; } bool Date::leapYear() const { bool leap=false; if(year%4==0) leap=true; if(year%100==0 && year%400!=0) leap=false; return leap; }//leapYear bool leapYear(int yr) { bool leap=false; if(yr%4==0) leap=true; if(yr%100==0 && yr%400!=0) leap=false; return leap; }//leapYear int Date::weekday() const { //returns 0 for Sunday, 1 for Monday, etc. static int t[] = { 0, 3, 2, 5, 0, 3, 5, 1, 4, 6, 2, 4 }; int y =year; y-= month return ( y + y/4 - y/100 + y/400 + t[month-1] + day) % 7; }//weekday int Date::getMonth() const { //private variables cannot be accessed directly but require "getter" functions return month; }//getMonth int Date::getDay() const { return day; }// int Date::getYear() const { return year; }//getYear string Date::toString() const { stringstream oss; //a stream to append the values oss return oss.str(); } bool Date::operator==(const Date& otherDate) { return (month==otherDate.month && day==otherDate.day && year==otherDate.year); }//operator == bool Date::operator //A date is less than another date if is earlier bool result=false; //assume false until proven true if(year else if(year==otherDate.year && month else if(year==otherDate.year && month==otherDate.month && day return result; }//operator bool Date::operator>(const Date& otherDate) { //Convert both dates to Julian and compare the Julian dates int jd1=julian(); int jd2=otherDate.julian(); return jd1>jd2; }//operator ostream& operator output return output; } // operator istream& operator >> (istream &input, Date &d) { string s; input >> s; Date other(s); //create a new Date d=other; //assign the new Date to d return input; } // operator >>
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