java - how to initialize a destructive variable? -


this question has answer here:

hi want ask how initialize variable when you're gonna use in condition? here's code made far..

import java.io.*;  public class bwiset{     public static void main(string[]args){         bufferedreader br=new bufferedreader(new inputstreamreader(system.in));         int t=0;         double v=0;           string vt,tt;         double tc;  try{          system.out.print("==================================\nvehicle type \tcharge per km \n car \t\t php0.50\n light truck \t php0.75");         system.out.print("\n bus \t\t php1.00");         system.out.print("\n heavy truck \t php1.25\n");         system.out.print("==================================\n");         system.out.print("km travelled \t ticket color\n");         system.out.print("   15 \t \t yellow\n");         system.out.print("   25 \t \t blue\n");         system.out.print("   50 \t \t red\n");         system.out.print("   75 \t \t orange\n");             system.out.println("welcome! please enter vehicle type: ");         vt=br.readline();         system.out.println("enter ticket type: ");         tt=br.readline();              if (vt=="car"||vt=="car"||vt=="car"||vt=="car"||vt=="car"||vt=="car"||vt=="car"){             v=0.50;         }else if (vt=="light truck"||vt=="light truck"||vt=="light truck"){             v=0.75;         }else if (vt=="bus"||vt=="bus"||vt=="bus"){             v=1.00;         }else if (vt=="heavy truck"||vt=="heavy truck"||vt=="heavy truck"){             v=1.25;         }            if (tt=="yellow"||tt=="yellow"||tt=="yellow"){             t=15;         }else if (tt=="blue"||tt=="blue"||tt=="blue"){             t=25;         }else if (tt=="red"||tt=="red"||tt=="red"){             t=50;         }else if (tt=="orange"||tt=="orange"||tt=="orange"){             t=75;         }             tc=v*t;            system.out.println("vehicle type: " + vt);         system.out.println("ticket type:" + tt);         system.out.println("charge according vehicle: " + v);         system.out.println("kilometers traveled according ticket: " + t);         system.out.print("total toll charge: " + tc);    }catch(ioexception e){ }      } }

to make short, program runs when input vehicle type , ticket type, still returns 0 isn't supposed happen-- because used conditions assigns value each vehicle type , ticket types (also shown in table comes program). i've tried search proper initializations related can't find , confused. please help. sorry bein such noob

don't use == compare string values; in java, objects, == compares object references determine if refer same object.

use string#equals compare string values.

if (vt.equals("car") || vt.equals("car"))

in fact, string#equalsignorecase better in case, cut down on number of conditions in each if statement:

if (vt.equalsignorecase("car"))

Comments

Post a Comment

Popular posts from this blog

php - cannot display multiple markers in google maps v3 from traceroute result -

i'm newbie in php mysql , google maps v3. have problems in google maps v3. made traceroute web based , map traceroute's result in google maps v3 final project of college education. have try many tutorials didn't work. have tried tutorials in forum nothing worked. problem cannot display multiple markers got location data database. maybe because i'm newbie , not know how do. confuse looping show markers. here code <?php error_reporting(e_all ^ (e_notice)); ini_set('max_execution_time', 360); $enable_log_user = false; global $ip, $host_name, $host_ip; $host = @$_post['host']; $trace = @$_post['trace']; $self = $_server['php_self']; include("phpsqlajax_dbinfo.php"); $connection = mysql_connect ('127.0.0.1', $username, $password); if (!$connection) { die('not connected : ' . mysql_error());} $db_selected = mysql_select_db($database, $connection); if (!$db_selected) { die ('can\'t use db :
Read more

c# - DetailsView in ASP.Net - How to add another column on the side/add a control in each row? -

i have detailsview control on page used edit various fields of record, works in respect. i looking way add 1 column (and if works, why not more) right, absolutely read-only, show same fields of record comparison purposes. i aware there no obvious way such thing out of box detailsview . have looked other controls (transposed gridview , recommended formview , listview ), nothing satisfies. have special data binding setup using detailsview , can't out of without losing features. anyone on how "hack in" additional columns (for display only) on detailsview ? the solution have now, use second detailsview , visible set false in aspx. in code, make sure databind hidden detailsview hosts data third column first, initial detailsview named itemdetails . and in item created event, pass third column html rendering of hidden controls (in last code block) : protected void itemdetails_itemcreated(object sender, eventargs e) { if (dataite
Read more

javascript - firefox memory leak -

i have following script (i use raphaeljs also) draws circle, waits 1 second, draws circle again, etc (you can copy paste - functional, need include raphael raphaeljs.com): <div id="holder"> </div> <script src="raphael.js" type="text/javascript"></script> <script> var paper = raphael(10, 50, 320, 200); var rad = math.pi / 180; var finangle = 0; function sector(cx, cy, r, startangle, endangle, params) { var x1 = cx + r * math.cos(-startangle * rad), x2 = cx + r * math.cos(-endangle * rad), y1 = cy + r * math.sin(-startangle * rad), y2 = cy + r * math.sin(-endangle * rad); return ["m", cx, cy, "l", x1, y1, "a", r, r, 0, +(endangle - startangle > 180), 0, x2, y2]; } var path = sector(100,100,50,0,180); var arc = paper.path(path); function draw() { path = sector(100,100,50,0,finangle);
Read more