How to write code to achieve date effect

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The usage of printf "d", 02: less than two digits to make up 0

# include#include#include#includeusing namespace std;int days [13] = {0int leap=year0&&year%4==0 31month==2 2831jort 31jort 31jort 31jiggle 31jort 31jort 31pjort 31page31}; bool check_date (int year,int month,int day) {if (month==0 | | month > 12) return false; if (day==0 | | monthically qualified people's day > days [month]) return false; if (month==2) {int leap=year0&&year%4==0 | | year%400==0; if (day > 28+leap) return false;} return true;} int main () {int Scanf ("% d/%d/%d", & int for 19600101); / / enumerates eight-digit for between January 1, 1960 and December 31, 2059.