+= plus equal sign

[Growl]

What does += mean?

int julian_day( int month, int day, int year )
{
  int jday = 0;
  for (int m=1; m<month; ++m )
    { 
      jday += DaysInMonth[m];
      if ( m == 2 && is_leap_year(year))
          ++jday;  // February 29th
    }
  jday += day;
  return jday;
}
 

Thanks a lot

[JosAH]

+= is the 'add assignment operator; e.g.

int foo= 1;
 
foo+= 41; // foo has value 42 now
 

You can do the same with most of the other binary operators; && and || can't
be used like that.

kind regards,

Jos

[puppysri]

eg a+=1 means a=a+1 such an operation can be used for all arithmetic operations