how many months have 31 days
How many months have 31 days in C++?
To determine the number of months that have 31 days in C++, you can use the ctime
library and the struct tm
structure. The struct tm
structure represents a calendar time, and it has a member called tm_mon
that represents the month (0-11, where 0 is January and 11 is December).
Here's an example code snippet that counts the number of months with 31 days:
#include <iostream>
#include <ctime>
int main() {
int count = 0;
for (int month = 0; month < 12; month++) {
// Set the month and year in the struct tm
struct tm timeinfo = {0};
timeinfo.tm_mon = month;
timeinfo.tm_year = 2023 - 1900; // Year is 2023
// Normalize the struct tm
mktime(&timeinfo);
// Check if the month has 31 days
if (timeinfo.tm_mday == 31) {
count++;
}
}
std::cout << "Number of months with 31 days: " << count << std::endl;
return 0;
}
In this code, we iterate over the months from 0 to 11 (representing January to December). For each month, we set the month and year in the struct tm
variable timeinfo
. We then call mktime
to normalize the struct tm
. Finally, we check if the tm_mday
member of timeinfo
is equal to 31, indicating that the month has 31 days. If it does, we increment the count
variable.
The output of this code will be the number of months with 31 days in the specified year (2023 in this case).
Please note that this code assumes a Gregorian calendar and may not work correctly for other calendar systems.