C++ program that print out calendar using month and year as input. Fix out the error plx

Question

#include<iostream
#include<iomanip>
#include<c.math>
using namespace std;

int GetDaysInMonth,Leaf Year,GetDayOfWeek

bool IsLeafYear (const int year) {
return ((year%400==0) || (year%4==0 && year%100!=0));
}
int GetDaysInMonth (const int year, const int month) {
switch (month) {
case 2:
return IsLeapYear(year) ? 29 : 28;
case 4:
case 6:
case 9:
case 11: return 30;
default: return 31;
}
}
int GetDayOfWeek(const int year, const int month) {
/* 0 = Sunday */
const int d = 1;
int y = year - (month < 3);
static int t[] = {0, 3, 2, 5, 0, 3, 5, 1, 4, 6, 2, 4};
return (y + y/4 - y/100 + y/400 + t[month-1] + d) % 7;
}
void ShowCal(const int year, const int month)
{
string monthName[] = {"January","February","March","April","May","June","July",
"August","September","October","November","December"};
int days = GetDaysInMonth(year, month);
int dow = GetDayOfWeek(year, month);
cout << monthName[month-1] << endl;
cout << " Sun Mon