Need help with extra credit problem

[Shawnzee]

I have an extra credit project where I'm supposed to calculate an approximate the user's age based on the current date and their birthday. My problem is that I am not getting the proper date and time. C++ keeps giving me some random date. I looked up c++ time format on the internet because this is extra credit and not in my book.

I am currently using dev C++ 4.9.9.2.

Thanks in advance for any help I receive.

Here is my current code :

/*

*/

// included libraries
#include <cstdlib>
#include <iostream>
#include <iomanip>
#include <time.h>

#define cls system("cls") 
#define pauseOutput system("pause")


void printM(int x);
void age(int m, int d, int y, int &yearAge, int &monthAge, int &dayAge);


using namespace std;

int main()
{
    time_t nowIsTheMoment; // set time variable nowIsTheMoment
    int bMonth,bDay, bYear;
    int yearAge, monthAge, dayAge;
    
    cout << "The current time is, " << ctime(&nowIsTheMoment) << endl << endl;
    
    cout << "Enter your birth month in number format ex. 1 for January: ";
    cin >> bMonth;
    while(cin.fail())
    {
         cin.clear();
         cout << "Error\n";
         cout << "Enter your birth month in number format ex. 1 for January: ";
         cin >> bMonth;         
    }
    while(bMonth < 1 || bMonth > 12) 
    {
         cin.clear();
         cout << "Error\n";
         cout << "Enter your birth month in number format ex. 1 for January: ";
         cin >> bMonth;        
    }
    cin.clear();
    
    
    cout << "\nEnter your birth date: ";
    cin >> bDay;
    while(cin.fail())
    {
         cin.clear();
         cout << "Error\n";
         cout << "Enter your birth date: ";
         cin >> bDay;         
    }
    while(bDay < 1 || bDay > 31) 
    {
         cin.clear();
         cout << "Error\n";
         cout << "Enter your birth date: ";
         cin >> bDay;        
    }
    cin.clear();
    
    cout << "\nEnter your birth year: ";
    cin >> bYear;
    while(cin.fail())
    {
         cin.clear();
         cout << "Error\n";
         cout << "Enter your birth year: ";
         cin >> bYear;         
    }
    cin.clear();
    
    cout << "\n --- Your Birthday --- " << endl << endl;
    printM(bMonth);
    cout << " " << bDay << ", " << bYear << endl;
    
    age(bMonth,bDay,bYear,yearAge,monthAge,dayAge);
    
    cout << yearAge << " " << monthAge << " " << dayAge;
    
    system("PAUSE");
    return EXIT_SUCCESS;
}

void printM(int x)
{
     //Choose and print Month
     switch ( x )
     {
           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;
     
     }
     
}

void age(int m, int d, int y, int &yearAge, int &monthAge, int &dayAge)
{
     time_t nowIsTheMoment; // set time variable nowIsTheMoment
     time(&nowIsTheMoment);
    
     struct tm* timeinfo;
     timeinfo = localtime( &nowIsTheMoment );
     
     yearAge = (timeinfo->tm_year) - y;
     monthAge = timeinfo->tm_mon - m;
     dayAge = timeinfo->tm_mday - d;
     
    
    
    
}

[Zlatomir]

You are getting the wrong year because tm struct has a particular year representation see the "year format" here: http://www.cplusplus.com/reference/ctime/tm/

And the random values most likely come because in the main function you don't initialize the nowIsTheMomentVariable:

int main()
{
    time_t nowIsTheMoment; // set time variable nowIsTheMoment
    time(&nowIsTheMoment); //add a call to time(...)
//...