How to calculate age from year of birth?

Question

The actual year should not be static

Answer 1

Consider this: (year of birth for example = 1957)

#include <iostream>
#include <ctime>
using namespace std;

int date_of_birth = 1957; // for example

int main( )
{
time_t now = time(0); // number of seconds since January 1, 1970
tm *ltm = localtime(&now); // tm class with tm_year attribute
cout « (1900 + ltm->tm_year - date_of_birth); // tm_year is since 1900
}

Output: 59

PD: it takes information from OS

Answer 2

current year - birth year

should do it? That is, if you're not counting months and days.