Constructing do while loop to handle account numbers not working C++ -

-

i'm trying use while loop evaluate account numbers. valid account number has have 5 digits , start letters r or b, not case sensitive.

valid account number examples: r90000 b10101 r88888 b77777

invalid account number examples: y90000 r888822

this loop i've made, , can't figure out what's wrong parameters that's causing repeat on , on again, never excepting account number.

char accounttype; int accountnum;  cout << "please enter account number." <<endl; cout << ">> "; cin >> accounttype >> accountnum; cout <<endl;   {     cout << "that not valid account number. please enter account number." <<endl;     cout << ">> ";     cin >> accounttype >> accountnum;     cout <<endl; }while ( (accountnum <= 9999) || (accountnum >= 100000) && (accounttype != 'r') || (accounttype != 'r') || (accounttype != 'b') || (accounttype != 'b') );

any ideas?

your conditions repeating loop any of:

  1. accountnum <= 9999
  2. accountnum >= 100000 && accounttype != 'r'
  3. accounttype != 'r'
  4. accounttype != 'b'
  5. accounttype != 'b'

but every character, @ least 2 of (3), (4), , (5) true, you'll repeat.

you need loop while all of accounttype checks fail or of accountnum checks fail. is, of:

  1. accountnum <= 9999
  2. accountnum >= 100000
  3. accounttype != 'r' && accounttype != 'r' && accounttype != 'b' && accounttype != 'b'

Comments

Post a Comment

Popular posts from this blog

c# - How Configure Devart dotConnect for SQLite Code First? -

-
can configure following sample code ? when run following code, error : no entity framework provider found ado.net provider invariant name 'devart.data.sqlite' setting in machine.config <system.data> <dbproviderfactories> <add name="dotconnect sqlite" invariant="devart.data.sqlite" description="devart dotconnect sqlite" type="devart.data.sqlite.sqliteproviderfactory, devart.data.sqlite, version=4.6.287.0, culture=neutral, publickeytoken=09af7300eec23701" /> </dbproviderfactories> </system.data> after add below block code in app.config <?xml version="1.0"?> <configuration>   <configsections> <!-- more information on entity framework configuration, visit http://go.microsoft.com/fwlink/?linkid=237468 --> <section name="entityframework" type="system.data.entity.internal.configfile.entityframeworksection, entit...
Read more

java - Copying object fields -

-
what best way of copying classes when need have 2 independent variables? have simple class: public class myclass { boolean = false; string b= "not empty"; } do need make method : assign(myclass data ) { a= data.a; b= data.b; } is there automatic method copy (duplicate) objects in java? do need make method : pretty close. instead of making method, should make constructor. such constructors called copy constructor , , create them this: myclass(myclass data) { = data.a; b = data.b; } and create copy of instance, use constructor this: myclass obj1 = new myclass(); myclass obj2 = new myclass(obj1); copy constructor can tedious : using copy constructor create deep-copy can tedious, when class has mutable fields. in case, assignment create copy of reference, , not object itself. have create copy of fields (if want deep copy). can go recursive. a better way create deep copy serialize , deserialize object. why not use clone()? ...
Read more

c++ - Clear the memory after returning a vector in a function -

-
i have function processes , stores lot of data in , returns results vector of class. amount of data stored in function tremendous , want clear storage memory of function after finished job. necessary (does function automatically clear memory) or should clear memory function? update: vector<customers> process(char* const *filename, vector<int> id) { vector<customers> list_of_customers; (perform actions) return list_of_customers; } variables defined locally within function automatically released @ end of function scope. destructors objects called, should free memory allocated objects (if objects coded correctly). example of such object std::vector . anything you've allocated new must have corresponding delete release storage. try avoid doing own allocation , use raii instead, i.e. containers or smart pointers.
Read more