C, printing a month chosen by user - c

Question

I'm doing a school project where I need to ask for a year and a month to be printed like a calendar. The problem is that when I debug it shows the whole year and not just the chosen month.
What changes do I have to do? Hope you can help me!
This is my code:
int SetFirstDay(int year)
{
int d;
int d1, d2, d3;
d1 = (year - 1.) / 4.0;
d2 = (year - 1.) / 100.;
d3 = (year - 1.) / 400.;
d = (year + d1 - d2 + d3) % 7;
return d;
}
int main()
{
int day, month, year, ndays, DayWeek = 0, FirstDay;
do
{
printf("\nEnter the desired year [2000 - 2099]\n");
scanf_s(" %d", &year);
} while (year < 2000 || year > 2100);
do
{
printf("\nEnter the desired month [1 - 12]\n");
scanf_s(" %d", &month);
} while (month < 1 || month > 12);
char *months[] = { "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December" };
int DayMonth[] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
if ((year % 4 == 0 && year % 100 != 0) || (year % 400 == 0))
DayMonth[1] = 29;
FirstDay = SetFirstDay(year);
for (month = 0; month < 12; month++)
{
ndays = DayMonth[month];
printf("\n\n--------------%s-----------------\n", months[month]);
printf("\n Sun Mon Tue Wed Thu Fri Sat\n");
for (DayWeek = 0; DayWeek < FirstDay; DayWeek++)
{
printf(" ");
}
for (day = 1; day <= ndays; day++)
{
printf("%5d", day);
if (++DayWeek > 6)
{
printf("\n");
DayWeek = 0;
}
FirstDay = DayWeek;
}
}
printf("\n\n\n");
system("pause");
return 0;
}

Answer 1

Save the month value which comes from user input to an additional variable:
int monthTmp = month;
Then prefix all printf invokations with the following statement withing the "month" for loop:
for (month = 0; month < 12; month++)
{
// ...
if (monthTmp==month) printf(.........
It is not an optimized solution, but it is very straightforward.