Why basic math functions aren't overloaded for different types in Java, Math? -


i have interesting question. figured out, math.pow() takes (double, double) args , wonder why there no overloaded functions other types combinations such (int, int) or (int, double) atc ...

i think big hole , paintfull weakness belive there reason. can explain me, please?

consider these 2 methods:

private int simplepow(int x) {     return x * x; } private int harderpow(int x) {     return (int) math.pow(x, 2); }

first 1 faster second... problem is, if know, use power (int, int), calculation effective , don't need take care of problems double variables.

well 1 should concerned (int, int) overload; others take double parameter should result in doubles anyway (double, double) method do. why there no (int, int) overload? because exponentiation grows fast, , since ints 32 bits long, there limited number of parameters such 1 raised other in range. doubles have much larger range don't have similar problem (to clear, doubles can overflow too, can hold maximum value of 1.8e308; larger of int). can of course implement own method take integer power, done here (the accepted answer makes use of exponentiation squaring, can applied (double, int) case).


-

Comments

Post a Comment

Popular posts from this blog

android - Automated my builds -

i have multiple app , android project want automated in build , release sequence. have ant script build , create apk of app. want have 1 script or ant file start build sequence app. maybe don't konw search, can't find easy documentation on ant. the point of use jenkins ant (or maven, i'm not sure of difference between them now) automated build sequence when people commit on project. any int appreciated maven dependencies (over ant) don't need pass around jars. recommend maven on ant day. syntax , overall process easier understand, @ end of both build tools. if able to, more recommend upgrading gradle. easy create different build types , create them ./gradlew assemble here project jake wharton can see power of gradle. there release , debug build, can make lot more if like. https://github.com/jakewharton/u2020 here android docs gradle http://tools.android.com/tech-docs/new-build-system/user-guide . if can't find looking here, check out main grad...
Read more

how to proxy from https to http with lighttpd -

i have internal site (192.168.2.1) accessible http on different server run public web-server using lighttpd. can make internal site accessible outside work follows $http["host"] == "internal.example.com" { ... proxy.server = ( "" => ( "internal" => ( "host" => "192.168.2.1", "port" => 8000 ) ) } this works, use https outside world. question is, how can proxy going https http ? i've tried this: $server["socket"] == ":443" { $http["host"] == "internal.example.com" { ... proxy.server = ( "" => ( "internal" => ( "host" => "http://192.168.2.1", "port" => 8000 ) ) } } but doesn't seem wor...
Read more

python - Flask migration error -

i've got application build on flask , wanted create new migration today. when run $python manage.py db upgrade i got message raise util.commanderror('only single head supported. ' alembic.util.commanderror: single head supported. script directory has multiple heads (due branching), must resolved manually editing revision files form linear sequence. run alembic branches see divergence(s). so run command $alembic branches no config file 'alembic.ini' found, or file has no '[alembic]' section any clue on about? the error messages coming alembic, use command form alembic <command> , integrating flask coming flask-migrate, need use form python manage.py db branches . to resolve multiple branches, make 1 of branches point down other branch upgrade graph straight line. see alembic's docs on branches: http://alembic.readthedocs.org/en/latest/branches.html
Read more