int happy(int year, int month, int day){ if (month > 12 || month < 1) { return -1; } else { if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0)//Leap year { if (month == 2) { if (day > 29 || day < 1) return -2; else return 1; } } if (month == 4 || month == 6 || month == 9 || month == 11) { if (day < 1 || day>30) return -2; else return 1; } else if (month != 2) { if (day < 1 || day>31) return -2; else return 1; } else { if (day < 1 || day>28) return -2; else return 1; } } return 1;}
#include <stdio.h>
int main(void) { int year; int month; int day;
//Input year, month, and day scanf("%d%d%d",&year,&month,&day);
//Check if the month is valid if (month >= 1 && month <= 12) { if ((month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month ==12)&& day <= 31) { printf ("YES"); } else if ((month == 4 || month == 6 || month == 9 || month == 11) && day <= 30) { //Check for months with 30 days printf("YES"); } else if (month == 2 && day <= 29) { //Check February for leap year days if ((year % 100 != 0 && year % 4 == 0) || year % 400 == 0) { printf("YES"); } else if (day <= 28) { printf("YES"); } else { printf("NO"); } } else { printf("NO"); } } else { printf("NO"); } while(1);}