Answer:
#include <iostream>
#include <string>
using namespace std;
int main() {
string mth;
int dy;
cin >> mth >> dy;
if ((mth == "January" && dy >= 1 && dy <= 31) || (mth == "February" && dy >= 1 && dy <= 29) || (mth == "March" && dy >= 1 && dy <= 19) || (mth == "December" && dy >= 21 && dy <= 30))
cout << "Winter" << endl;
else if ((mth == "April" && dy >= 1 && dy <= 30) || (mth == "May" && dy >= 1 && dy <= 30) || (mth == "March" && dy >= 20 && dy <= 31) || (mth == "June" && dy >= 1 && dy <= 20))
cout << "Spring" << endl;
else if ((mth == "July" && dy >= 1 && dy <= 31) || (mth == "August" && dy >= 1 && dy <= 31) || (mth == "June" && dy >= 21 && dy <= 30) || (mth == "September" && dy >= 1 && dy <= 21))
cout << "Summer" << endl;
else if ((mth == "October" && dy >= 1 && dy <= 31) || (mth == "November" && dy >= 1 && dy <= 30) || (mth == "September" && dy >= 22 && dy <= 30) || (mth == "December" && dy >= 0 && dy <= 20))
cout << "Autumn" << endl;
else
cout << "Invalid" << endl;
return 0;
}
Explanation: