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+= plus equal sign

5
What does += mean?
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  1. int julian_day( int month, int day, int year )
  2. {
  3.   int jday = 0;
  4.   for (int m=1; m<month; ++m )
  5.     { 
  6.       jday += DaysInMonth[m];
  7.       if ( m == 2 && is_leap_year(year))
  8.           ++jday;  // February 29th
  9.     }
  10.   jday += day;
  11.   return jday;
  12. }
  13.  
Thanks a lot
Jul 28 '07 #1
2 70932
JosAH
11,448 Expert 8TB
+= is the 'add assignment operator; e.g.

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  1. int foo= 1;
  2.  
  3. foo+= 41; // foo has value 42 now
  4.  
You can do the same with most of the other binary operators; && and || can't
be used like that.

kind regards,

Jos
Jul 28 '07 #2
eg a+=1 means a=a+1 such an operation can be used for all arithmetic operations
Jul 28 '07 #3

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