### 6.31. `CBCData.degMinAdd()`: Lat/long arithmetic

pycbc.py
```# - - -   C B C D a t a . d e g M i n A d d

'''Arithmetic on 'ddmm' and 'dddmm' quantities.

[ (ddmm is a string of four or five digits such that
the last two are minutes and the rest are degrees) and
(plusMinutes is an int) ->
return a string of the form "dddmm" representing
ddmm + plusMinutes as degrees and minutes
'''
```

This function is used by Section 6.30, “`CBCData.overlappers()`: Find overlapping circles” to compute the range of latitudes and longitudes that are within a given distance of a circle's center.

pycbc.py
```        #-- 1 --
# [ dd  :=  degrees part of ddmm as an int
#   mm  :=  minutes part of ddmm as an int ]
dd = int(ddmm[:-2])
mm = int(ddmm[-2:])

#-- 2 --
# [ minutes  :=  sum of dd degrees, mm minutes, and plusMinutes ]
minutes = dd*60 + mm + plusMinutes

#-- 3 --
# [ return minutes as degrees and minutes in "dddmm" form ]
ddNew, mmNew = divmod(minutes, 60)
return "%03d%02d" % (ddNew, mmNew)
```