java - Possible class error? -



java - Possible class error? -

class randomagain { public static void main(string args[]){ scanner tuna = new scanner(system.in); boom boomobj = new boom(); system.out.println("~~calculator~~"); system.out.print("enter 1st number: "); int first_num = tuna.nextint(); system.out.print("enter 2nd number: "); int second_num = tuna.nextint(); system.out.print("what want do? [plus,sub,mult,div]: "); string selection = tuna.nextline(); if (choice == "plus") boomobj.addition(first_num, second_num); if (choice == "sub") boomobj.subtraction(first_num, second_num); if (choice == "mult") boomobj.multiply(first_num, second_num); if (choice == "div") boomobj.division(first_num, second_num); else {system.out.println("please check fields again!! ");} } }

boom class:

public class boom { private int sub_final, add_final, multi_final, div_final; public void addition(int a, int b){ add_final = + b; system.out.println(a+ " + " +b+ " = " +add_final); } public void subtraction(int a, int b){ sub_final = - b; system.out.println(a+ " - " +b+ " = " +sub_final); } public void multiply(int a, int b){ multi_final = * b; system.out.println(a+ " * " +b+ " = " +multi_final); } public void division(int a, int b){ div_final = + b; system.out.println(a+ " / " +b+ " = " +add_final); } }

when run it, in 3rd command, :

what want do? [plus,sub,mult,div]: please check fields again!!

and can't type reply.

tuna.nextline() read content in inputstream until finds line break (line separator), empty text between sec number entered , enter key.

change tuna.next() create work.

apart of that, should compare strings using equals method, not using ==:

//if (choice == "plus") if (choice.equals("plus")) { //... }

another problem in code lastly else sentence affects closest if statement. code currently:

if (choice.equals("plus") { } if (choice.equals("sub") { } if (choice.equals("mul") { } if (choice.equals("div") { } else { } //only affects here

which means if come in text different "div" programme execute code in else statement. code should alter to:

if (choice.equals("plus") { } else if (choice.equals("sub") { } else if (choice.equals("mul") { } else if (choice.equals("div") { } else { }

java

Comments

Post a Comment

Popular posts from this blog

model view controller - MVC Rails Planning -

model view controller - MVC Rails Planning - i'm starting rails , i'm building app stores films info, user can watch film , give grade on web application. i have coded cinema model, controller , views. now, have 2 questions: should need create model , controller grading? in case, should create or should wait , create first users model , controller? yes, on model , controller grades. that'd feasible way maintain track of who's graded what. it's create first, i'd start users, since grades depend on both films , users. ruby-on-rails model-view-controller
Read more

ruby on rails - Devise Logout Error in RoR -

ruby on rails - Devise Logout Error in RoR - while using devise in ror, encountering unusual error when trying log out url different root url. displays me : actioncontroller::invalidauthenticitytoken in devise::sessionscontroller#destroy" for illustration if rooting path after log in '/structure', , seek log out '/general' error, while logging out '/structure' fine. any help highly appreciated. ruby-on-rails ruby devise
Read more

html - Submenu setup with jquery and effect 'fold' -

html - Submenu setup with jquery and effect 'fold' - i want open submenu jquery effect fold, problem if user "hover effect" fast menu remain open, how can avoid this, jquery code is: $('ul.mainmenu li').hover( function() { $(this).children('ul').show('fold', 570); }, function() { $(this).children('ul').hide('fold', 500); } ); my jsfiddle link is: http://jsfiddle.net/9wkbf/ updated fiddle the reason behind problem is, first event $(this).children('ul').show('fold', 570); queued , until completes, sec animation not start. the next snippet can workaround $('ul.mainmenu > li').hover( function() { $(this).children('ul').show('fold', 570); }, function() { $('ul:not(.mainmenu)').hide('fold', 500); } ); *important note : work current scenario. jquery html css
Read more