C++ help

[Chasem121]

How do I check to see if they used more or less than 4 digits on the year?

#include <iostream>#include <iomanip>using namespace std;int main(){    int Day;    int Month;    int Year;    int Year2num;        cout << "Enter the day\n";    cin >> Day;    cout << "Enter the Month\n";    cin >> Month;    cout << "Enter the Year in a 4 digit format(XXXX)\n";    cin >> Year;        if (Day >= 1)    {        if (Month >= 1)        {            if (Year <= 1)            {    cout << "Error: The numbers can not be less than 1";                return 0;            }        }        else        {    cout << "Error: The numbers can not be less than 1";            return 0;        }    }    else    {            cout << "Error: The numbers can not be less than 1";        return 0;    }    Year2num = (Year % 100);    if (Year2num == Day * Month)        cout << "This is a magic date!\n";    else        cout << "This is not a magic date!\n";    cout << "Program complete";    return 0;}

[79wjd]

if(year >= 9999) /

You could also do:

if(year/10^4 != 0)

[Chasem121]

if(year >= 9999)

But that would allow a user to enter something like 1, or 333. I need it to be in 4 digits, so something like 0001 or 0333

[79wjd]

But that would allow a user to enter something like 1, or 333. I need it to be in 4 digits, so something like 0001 or 0333

If you assign 0333 to an int then that int will hold the value 333 though.

int x = 0333; printf("%d\n", x); //will print 333 

[Nineshadow]

if(year/10^4 != 0)

^ is XOR from what I can remember. Either use pow, but that's really not needed, or use 1e4 or even 10000.

[madknight3]

How do I check to see if they used more or less than 4 digits on the year?

 

I suppose you could use the obvious

if (year < 1000 || year > 9999)

edit: Just saw this 

 

But that would allow a user to enter something like 1, or 333. I need it to be in 4 digits, so something like 0001 or 0333

 

You could get the input as a string instead of an int and use length().

[Zeldhoron]

std::string input;std::getline(std::cin, input);if (input.length() != 4) std::cout << "Invalid input" << std::endl;else std::cout << "Valid input" << std::endl;

you'l need to #include <string>