ช่วยแก้โค้ดจาก dev c เป็น c++ ให้หน่อยค่ะ

#include<iostream.h>
#include<conio.h>

int step1 (int);
void month_name(int);
int no_days(int,int);
int leap(int);

void main()
{
restart:
clrscr();
cout<<"Enter year : ";
unsigned int y,m;
cin>>y;
int x;
x=step1(y);
int month[14][12]= {1,4,4,7,2,5,7,3,6,1,4,6,
             2,5,5,1,3,6,1,4,7,2,5,7,
             3,6,6,2,4,7,2,5,1,3,6,1,
             4,7,7,3,5,1,3,6,2,4,7,2,
             5,1,1,4,6,2,4,7,3,5,1,3,
             6,2,2,5,7,3,5,1,4,6,2,4,
             7,3,3,6,1,4,6,2,5,7,3,5,
             1,4,5,1,3,6,1,4,7,2,5,7,
             2,5,6,2,4,7,2,5,1,3,6,1,
             3,6,7,3,5,1,3,6,2,4,7,2,
             4,7,1,4,6,2,4,7,3,5,1,3,
             5,1,2,5,7,3,5,1,4,6,2,4,
             6,2,3,6,1,4,6,2,5,7,3,5,
             7,3,4,7,2,5,7,3,6,1,4,6};
cout<<"Enter month (1 - 12) : ";
month_input:
cin>>m;
if(m<1 || m>12)
{
  cout<<"Enter a valid month (1 - 12) : ";
  goto month_input;
}
cout<<"

        ";
month_name(m);
cout<<' '<<y<<"

Mon    Tue    Wed    Thu    Fri    Sat    Sun
";
int j=month[x-1][m-1], days=no_days(m,y);
for (int i=0; i<j-1; i++)
  cout<<'    ';
for(i=1; i<=days; i++)
{
  cout<<i<<'    ';
  if(j==7)
  {
   cout<<'
';
   j=1;
  }
  else
   j++;
}
cout<<"

Try for another month? (y/n) : ";
char ch;
cin>>ch;
if(ch=='y' || ch=='Y')
  goto restart;
}
int step1 (int y)
{
int x=y%7;
x+=(y-1)/4;
x-=(y-1)/100;
x+=(y-1)/400;
x=x%7;
if(x==0)
  x=7;
if(leap(y))
  x+=7;
return x;
}
void month_name(int m)
{
switch(m)
{
  case 1 : cout<<"January";
    break;
  case 2 : cout<<"February";
    break;
  case 3 : cout<<"March";
    break;
  case 4 : cout<<"April";
    break;
  case 5 : cout<<"May";
    break;
  case 6 : cout<<"June";
    break;
  case 7 : cout<<"July";
    break;
  case 8 : cout<<"August";
    break;
  case 9 : cout<<"September";
    break;
  case 10: cout<<"October";
    break;
  case 11: cout<<"November";
    break;
  case 12: cout<<"December";
    break;
}
}

int no_days(int mon, int y)
{
int d;
switch(mon)
{
  case 1 :
  case 3 :
  case 5 :
  case 7 :
  case 8 :
  case 10:
  case 12: d=31;
       break;
  case 4 :
  case 6 :
  case 9 :
  case 11: d=30;
       break;
  case 2 : if(leap(y))
        d=29;
       else
        d=28;
       break;
}
return d;
}
int leap (int y)
{
if (y0==0)
  if (y%400==0)
   return 1;
  else
   return 0;
else
  if (y%4==0)
   return 1;
  else
   return 0;
}