int difference(struct date *d1, struct date *d2)
{
int days_in_months[12] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
long int number_of_days1, number_of_days2;
number_of_days1 = d1->year * 365 + d1->day;
for (int i = 0; i<d1->month - 1; i++)
number_of_days1 += days_in_months[i];
number_of_days1 += leapYears(d1);
number_of_days2 = d2->year * 365 + d2->day;
for (int i = 0; i<d2->month - 1; i++)
number_of_days2 += days_in_months[i];
number_of_days2 += leapYears(d1);
return number_of_days2 - number_of_days1 - 1;
}
int between_days(struct node *date1head, struct node *date2head){
if((date1head==NULL)||(date2head==NULL))
return -1;
int d1, d2, m1, m2, y1 = 0, y2 = 0;
int i = 0, r = 1000;
int month[12] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
int n1, n2;
d1 = (date1head->data) * 10 + (date1head->next->data);
date1head = date1head->next->next;
m1 = (date1head->data) * 10 + (date1head->next->data);
date1head = date1head->next->next;
while (date1head != NULL)
{
y1 = y1+date1head->data*r;
date1head = date1head->next;
r = r / 10;
}
d2 = (date2head->data) * 10 + (date2head->next->data);
date2head = date2head->next->next;
m2 = (date2head->data) * 10 + (date2head->next->data);
date2head = date2head->next->next;
r = 1000;
while (date2head != NULL)
{
y2 = y2 + date2head->data*r;
date2head = date2head->next;
r = r / 10;
}
n1 = y1 * 365 + d1;
n2 = y2 * 365 + d2;
for (int i = 0; i<m1 - 1; i++)
n1 += month[i];
n1 += leapYears(y1,m1);
for (int i = 0; i<m2 - 1; i++)
n2 += month[i];
n2 += leapYears(y2, m2);
return n2 - n1-1;
}
int main(){
std::vector<std::string> daysOfWeek = { "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday" };
std::vector<std::string> monthsOfYear = { "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December" };
std::vector<date> dateVector;
std::vector<int> leapYears(100);
std::vector<int> allYears(101);
date test;
int i = 1900;
std::cout << "Generating leap year dates..." << std::endl;
std::generate(leapYears.begin(), leapYears.end(), [&](){i++; if (i % 100 == 0 && i % 400 == 0) return i; if (i % 4 == 0) return i; return NULL; });
i = 1899;
std::cout << "Generating remaining dates..." << std::endl;
std::generate(allYears.begin(), allYears.end(), [&](){i++; return i;});
std::vector<int> leapYearList(25);
int k = 0;
for (int j = 0; j < leapYears.size(); j++){
if (leapYears[j] != 0){
//std::cout << leapYears[j] << std::endl;
leapYearList[k] = leapYears[j];
k++;
}
}
//leapYearList[k] contains all of the leap years
int size = 31;
for (int l = 0; l <= 100; l++){
//std::cout << "Year: " << allYears[l] << std::endl;
for (int m = 0; m < 12; m++){
//std::cout << "Month: " << monthsOfYear[m] << std::endl;
if (monthsOfYear[m] == "September" || monthsOfYear[m] == "April" || monthsOfYear[m] == "June" || monthsOfYear[m] == "November")
size = 30;
else if (monthsOfYear[m] == "February"){
for (int j = 0; j < leapYearList.size(); j++){
if (allYears[l] == leapYearList[j])
size = 29;
}
if (size != 29)
size = 28;
}
else{
size = 31;
}
for (int n = 0; n < size; n++){
o = n % 7;
if (allYears[l] > 1900){
test.dayOfMonth = n + 1;
test.dayOfWeek = daysOfWeek[o];
test.monthOfYear = monthsOfYear[m];
test.numYear = allYears[l];
dateVector.push_back(test);
}
//std::cout << "Day: " << n+1 << " " << daysOfWeek[o] << std::endl;
}
char check = 'x';
if (daysOfWeek[o][0] == 'T' && daysOfWeek[o][1] == 'h')
check = 'H';
else if (daysOfWeek[o][0] == 'S' && daysOfWeek[o][1] == 'u')
check = 'R';
else
check = daysOfWeek[o][0];
switch (check){
case 'R':
daysOfWeek = { "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday" };
break;
case 'M':
daysOfWeek = { "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday", "Monday" };
break;
case 'T':
daysOfWeek = { "Wednesday", "Thursday", "Friday", "Saturday", "Sunday", "Monday", "Tuesday"};
break;
case 'W':
daysOfWeek = { "Thursday", "Friday", "Saturday", "Sunday", "Monday", "Tuesday", "Wednesday"};
break;
case 'H':
daysOfWeek = { "Friday", "Saturday", "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday"};
break;
case 'F':
daysOfWeek = { "Saturday", "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday"};
break;
case 'S':
daysOfWeek = { "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};
break;
}
}
}
int answer = 0;
std::cout << "Summing the number of days..." << std::endl;
for (int i = 0; i < dateVector.size(); i++){
if (dateVector[i].dayOfMonth == 1 && dateVector[i].dayOfWeek == "Sunday" && dateVector[i].numYear > 1900)
answer++;
}
std::cout << "The answer is: " << answer << std::endl;
system("Pause");
return 0;
}