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#include <stdio.h>
#include <stdbool.h>
 
struct date
{
    int month;
    int day;
    int year;
};
 
 
struct date *dateUpdate (struct date *today);
int numberOfDays (struct date *d); /*int is returned as its size <= to that of a pointer*/
bool isLeapYear(struct date *d); /*bool is practically always smaller than a pointer*/
 
int main (void)
{
\\some code here doesn't make sense, uninitialized?
    struct date thisDay, nextDay;
    printf("Enter today's date (mm dd yyyy) : ");
    scanf("%i%i%i", thisDay.month, thisDay.day, thisDay.year) /* '&' shouldn't be here*/
 
    nextDay = dateUpdate(&thisDay);
 
    printf("Tomorrow's date is %i/%i/%.2i.\n", nextDay.month, nextDay.day, nextDay.year % 100);
 
    return 0;
}
 
 
struct date *dateUpdate (struct date *today)
{
    struct date tomorrow;
    int numberOfDays (struct date d);
 
    if(today.day != numberOfDays (today))
    {
        tomorrow = (struct date) {today.month, today.day + 1, today.year};
    }
    else if(today.month == 12)
    {
        tomorrow = (struct date) {1, 1, today.year + 1};
    }
    else
    {
        tomorrow = (struct date) {today.month + 1, 1, today.year};
    }
 
    return tomorrow;
}
 
int numberOfDays (struct date *d)
{
    int days;
    bool isLeapYear (d);
    const int daysPerMonth[12] =
        {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
 
    if(isLeapYear (d) && d->month == 2)
    {
        days = 29;
    }
    else
    {
        days = daysPerMonth[d->month - 1];
    }
 
    return days;
}
 
bool isLeapYear(struct date *d)
{
    bool leapYearFlag;
 
    if ( (d->year % 4 == 0 && d->year % d->year % 100 != 0) || d->year % 400 == 0)
    {
        leapYearFlag = true;
    }
    else
    {
        leapYearFlag = false;
    }
 
    return leapYearFlag;
}

prog.cpp:18:1: error: expected expression
\\some code here doesn't make sense, uninitialized?
^
prog.cpp:18:23: warning: missing terminating ' character [-Winvalid-pp-token]
\\some code here doesn't make sense, uninitialized?
                      ^
prog.cpp:21:62: error: expected ';' after expression
    scanf("%i%i%i", thisDay.month, thisDay.day, thisDay.year) /* '&' shouldn't be here*/
                                                             ^
                                                             ;
prog.cpp:21:21: error: use of undeclared identifier 'thisDay'
    scanf("%i%i%i", thisDay.month, thisDay.day, thisDay.year) /* '&' shouldn't be here*/
                    ^
prog.cpp:21:36: error: use of undeclared identifier 'thisDay'
    scanf("%i%i%i", thisDay.month, thisDay.day, thisDay.year) /* '&' shouldn't be here*/
                                   ^
prog.cpp:21:49: error: use of undeclared identifier 'thisDay'
    scanf("%i%i%i", thisDay.month, thisDay.day, thisDay.year) /* '&' shouldn't be here*/
                                                ^
prog.cpp:23:5: error: use of undeclared identifier 'nextDay'
    nextDay = dateUpdate(&thisDay);
    ^
prog.cpp:23:27: error: use of undeclared identifier 'thisDay'
    nextDay = dateUpdate(&thisDay);
                          ^
prog.cpp:25:48: error: use of undeclared identifier 'nextDay'
    printf("Tomorrow's date is %i/%i/%.2i.\n", nextDay.month, nextDay.day, nextDay.year % 100);
                                               ^
prog.cpp:25:63: error: use of undeclared identifier 'nextDay'
    printf("Tomorrow's date is %i/%i/%.2i.\n", nextDay.month, nextDay.day, nextDay.year % 100);
                                                              ^
prog.cpp:25:76: error: use of undeclared identifier 'nextDay'
    printf("Tomorrow's date is %i/%i/%.2i.\n", nextDay.month, nextDay.day, nextDay.year % 100);
                                                                           ^
prog.cpp:36:13: error: member reference type 'struct date *' is a pointer; did you mean to use '->'?
    if(today.day != numberOfDays (today))
       ~~~~~^
            ->
prog.cpp:36:35: error: no viable conversion from 'struct date *' to 'struct date'
    if(today.day != numberOfDays (today))
                                  ^~~~~
prog.cpp:4:8: note: candidate constructor (the implicit copy constructor) not viable: no known conversion from 'struct date *' to 'const date &' for 1st argument; dereference the argument with *
struct date
       ^
prog.cpp:34:35: note: passing argument to parameter 'd' here
    int numberOfDays (struct date d);
                                  ^
prog.cpp:38:40: error: member reference type 'struct date *' is a pointer; did you mean to use '->'?
        tomorrow = (struct date) {today.month, today.day + 1, today.year};
                                  ~~~~~^
                                       ->
prog.cpp:38:53: error: member reference type 'struct date *' is a pointer; did you mean to use '->'?
        tomorrow = (struct date) {today.month, today.day + 1, today.year};
                                               ~~~~~^
                                                    ->
prog.cpp:38:68: error: member reference type 'struct date *' is a pointer; did you mean to use '->'?
        tomorrow = (struct date) {today.month, today.day + 1, today.year};
                                                              ~~~~~^
                                                                   ->
prog.cpp:40:18: error: member reference type 'struct date *' is a pointer; did you mean to use '->'?
    else if(today.month == 12)
            ~~~~~^
                 ->
prog.cpp:42:46: error: member reference type 'struct date *' is a pointer; did you mean to use '->'?
        tomorrow = (struct date) {1, 1, today.year + 1};
                                        ~~~~~^
                                             ->
prog.cpp:46:40: error: member reference type 'struct date *' is a pointer; did you mean to use '->'?
        tomorrow = (struct date) {today.month + 1, 1, today.year};
                                  ~~~~~^
                                       ->
prog.cpp:46:60: error: member reference type 'struct date *' is a pointer; did you mean to use '->'?
        tomorrow = (struct date) {today.month + 1, 1, today.year};
                                                      ~~~~~^
                                                           ->
fatal error: too many errors emitted, stopping now [-ferror-limit=]
1 warning and 20 errors generated.

Standard output is empty