Next Date 求下一天的日期

没事做，写着玩玩

#include 
#include 
using namespace std;

struct Date{
    int y, m, d;
};

int pm[13] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

bool isRunnian(int y){
    if(y % 4 != 0) return 0;
    else{
        if(y%100 == 0 && y%400 != 0) return 0;
        else return 1;
    }
}

int main(){
    Date date;
    while(scanf("%d %d %d", &date.y, &date.m, &date.d) != EOF){
        if(isRunnian(date.y)) pm[2] = 29;
        else pm[2] = 28;
        if(date.m < 1 || date.m > 12){
            puts("imput error");
            continue;
        }
        if(date.d < 1 || date.d > pm[date.m]){
            puts("imput error");
            continue;
        }
        if(date.m == 12 && date.d == 31){
            printf("%d 1 1\n", date.y+1);
        }
        else if(date.d == pm[date.m]){
            printf("%d %d %d\n", date.y, date.m+1, 1);
        }
        else printf("%d %d %d\n", date.y, date.m, date.d+1);
    }
    return 0;
}