Установить порядковый номер дня в году по вводимому числу и месяцу (Переписать со структурой)

#include "stdafx.h"
#include <iostream>
 
using namespace std;
static char daytab[2][13] = {
{0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
{0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}};
 
 
 
int dengoda (int year, int month, int day)
 
{
int l;
char *p;
l = year%4 == 0 && year%100 != 0 || year%400 == 0;
p=daytab[l];
while (--month)
day+=*++p;
return day;
}
 
int _tmain()
 
{ int y,d,m;
cout<<"Vvedite den: \n";
cin>>d;
cout<<"Vvedite month: \n";
cin>>m;
cout<<"Vvedite god: \n";
cin>>y;
 
cout<<endl<<dengoda(y,m,d)<<endl;
return 0;
}

#include <iostream>
 
using namespace std;
 
struct date {
    int y;
    int d;
    int m;
};
 
static char daytab[2][13] = { { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30,
        31 }, { 0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 } };
 
int dengoda(date d) {
    int l;
    char *p;
    l = (d.y % 4 == 0) && (d.y % 100 != 0) || (d.y % 400 == 0);
    p = daytab[l];
    while (--d.m)
        d.d += *++p;
    return d.d;
}
 
int main()
 
{
    date data;
    cout << "Vvedite den: \n";
    cin >> data.d;
    cout << "Vvedite month: \n";
    cin >> data.m;
    cout << "Vvedite god: \n";
    cin >> data.y;
 
    cout << endl << dengoda(data) << endl;
    return 0;
}

#include "stdafx.h"
#include <iostream>
 
using namespace std;
static char daytab[2][13] = {
{0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
{0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}};
 
 
 
int dengoda (int year, int month, int day)
 
{
int l;
char *p;
l = year%4 == 0 && year%100 != 0 || year%400 == 0;
p=daytab[l];
while (--month)
day+=*++p;
return day;
}
 
void daymonth (int year, int dayyear, int *pmonth, int *pday)
 
{
int l;
char *p;
l = year%4 == 0 && year%100 != 0 || year%400 == 0;
p=daytab[l];
while (dayyear>*++p)
dayyear-=*p;
*pmonth=p-*(daytab+l);
*pday=dayyear;
}
 
int _tmain()
 
{ int y,d,pm,pd;
cout<<"Vvedite poryadkoviy nomer chisla: \n";
cin>>d;
cout<<"Vvedite god: \n";
cin>>y;
 
daymonth(y,d,&pm,&pd);
cout<<endl<<"Day: "<<pd<<endl;
cout<<"Month: "<<pm<<endl;
cout<<"Year: "<<y<<endl<<endl;
return 0;
}