How to make this C code shorter -


i have code toggles values in struct.

for example, find myself writing code lot looks this:

if(options.test == 1) {     options.test = 2; } else if (options.test == 2) {     options.test = 1; }

is there more compact version can use make code shorter?

if values of options.test either 1 or 2 throughout execution of program, can do:

options.test = 3-options.test;

if variable may set other values, best way handle with:

switch (options.test) {     case 1:   options.test = 2;   break;     case 2:   options.test = 1;   break;     case ...: options.test = ...; break;     case ...: options.test = ...; break;     case ...: options.test = ...; break;     default:  options.test = ...; break; }

if values between 0 , n (with relatively small n), may consider hashing.

for example, instead of:

switch (options.test) {     case 0: options.test = 4; break;     case 1: options.test = 2; break;     case 2: options.test = 1; break;     case 3: options.test = 3; break;     case 4: options.test = 5; break;     case 5: options.test = 0; break; }

you can do:

static int hash[] = {4,2,1,3,5,0}; options.test = hash[options.test];

Comments

Post a Comment

Popular posts from this blog

google app engine - 403 Forbidden POST - Flask WTForms -

i have flask application running on google app engine. trying submit form built using wtform , keep getting following error. 403 forbidden: don't have permission access requested resource. either read-protected or not readable server. location.html (part of code) <form method=post action="/home/location"> .... <button type="submit" class="btn btn-primary" value="submit"> directions </button> </form> main.py @app.route('/home/location', methods=['post', 'get']) def location(): form = cfcdirections.direction(request.form) print(request.method) if request.method == 'post' , form.validate(): print("after if") directions = cfcdirections() street_no = directions.no street = directions.street suburb = directions.suburb postcode = directions.postcode ...
Read more

Android layout hidden on keyboard show -

i have strange problem layout. when tap on edittext , keyboard shown edittext stay on bottom , when tap on to hide keyboard , keyboard hides , edittext go should when want input text. when tap again, keyboard shown , edittext goes down behind keyboard... <relativelayout android:layout_width="match_parent" android:layout_height="match_parent" > <scrollview android:layout_width="match_parent" android:layout_height="fill_parent" android:above="@+id/rl_commands"> <textview android:layout_width="match_parent" android:layout_height="wrap_content"/> </scrollview> <relativelayout android:layout_width="match_parent android:layout_height="24dp" android:id="@+id/rl_commands" android:alignparentbottom="true"> ...
Read more

Parse xml element into list in Python -

i've been trying days store list of coordinates list in python. i've tried minidom, xmlreader, , few others. i'm doing wrong, i'm on deadline , need help. <?xml version="1.0" encoding="utf-8"?> <kml xmlns="http://www.opengis.net/kml/2.2" xmlns:gx="http://www.google.com/kml/ext/2.2" xmlns:kml="http://www.opengis.net/kml/2.2" xmlns:atom="http://www.w3.org/2005/atom"> <document> <name>kmlfile</name> <style id="s_ylw-pushpin_hl"> <iconstyle> <scale>1.3</scale> <icon> <href>http://maps.google.com/mapfiles/kml/pushpin/ylw-pushpin.png</href> </icon> <hotspot x="20" y="2" xunits="pixels" yunits="pixels"/> </iconstyle> </style> <stylemap id="m_ylw-pushpin"> ...
Read more