Why cant I use the variable "i" from my constructor in other member functions? C++ -

-

i'm working on creating bank program programming methodology and, reason, can't seem use value assign variable i in constructor in of other member functions. instance, if user input 6 , i calculated 0.005 constructor, value (0.005) not passed makepayment function. instead, i reset zero.

can shed light on this? code below.

  loan_data::loan_data(double p, double n, double i) {     cout << "enter loan amount: $";     cin >> p;     cout << "enter loan length: ";     cin >> n;     cout << "enter credit score: ";     cin >> i;          = / 100;     = / 12;     n = n * 12;     bal = p;         = (p * ((i * pow(1 + i, n)) / (pow(1 + i, n) - 1)));          cout << "a is: " << << endl;         cout << "bal is: " << bal << endl;         cout << "i is: " << << endl; } void loan_data::makepayment(double pay) {         cout << "i is: " << << endl;         cout << "bal is: " << bal << endl;     cout << "enter payment amount: $";     cin >> pay;          cout << "bal is: " << bal << endl;      bal = ((i + 1) * bal) - pay;         cout << "i is: " << << endl;         cout << "bal is: " << bal << endl;         cout << "pay is: " << pay << endl;         cout << "a is: " << << endl;         = pay;         cout << "a is: " << << endl; }

i = / 100; setting parameter i, not member variable i (assuming such variable exists). parameter hiding member.

you can fix either using this->i (i.e. this->i = / 100), or changing parameter name doesn't collide member variable's name.

but perhaps should rid of parameter, given don't use (cin >> i; nukes whatever value had, making totally pointless pass in first place).


Comments

Post a Comment

Popular posts from this blog

PHP DOM loadHTML() method unusual warning -

-
i had following code works fine on localhost: $document = new domdocument(); $document->loadhtml($p_result); $form = $document->getelementsbytagname('form')->item(0); // code continues using $form variable after same code updated on outside server, loadhtml() failed , issued warning. warning: domdocument::loadhtml() expects parameter 1 valid path, string given in path/name/to/script.php returned null instead of object code pretty gets fatal error. note contents of $p_result absolutely same on outside server , on localhost. but why displays kind of warning , why not work? doesn't loadhtml() expects argument 1 string in first place? why method expects parameter 1 valid path ? just make clear i'm not calling loadhtmlfile() , i'm calling loadhtml() . thanks. you're affected one of php bugs . issue present in php 5.6.8 , 5.6.9. have affected php version on server, , bug-free version on localhost. the bug forbids null
Read more

python - How to create jsonb index using GIN on SQLAlchemy? -

-
here's current code creating index jsonb. index("mytable_data_idx_id_key", mytable.data['id'].astext, postgresql_using='gin') but got error. sqlalchemy.exc.programmingerror: (psycopg2.programmingerror) data type text has no default operator class access method "gin" hint: must specify operator class index or define default operator class data type. [sql: "create index event_data_idx_id_key on event using gin ((data ->> 'id'))"] is there way create index on sqlalchemy? the postgresql specific sqlalchemy docs @ http://docs.sqlalchemy.org/en/latest/dialects/postgresql.html#operator-classes mention postgresql_ops dictionary provide "operator class" used postgresql, , provide example illustrating use: index('my_index', my_table.c.id, my_table.c.data, postgresql_ops={ 'data': 'text_pattern_ops',
Read more

c# - TransactionScope not rolling back although no complete() is called -

-
i'm using transactionscope rollback transaction fail bool errorreported = false; action<importerrorlog> newerrorcallback = e => { errorreported = true; errorcallback(e); }; using (var transaction = new transactionscope()) { foreach (importtaskdefinition task in taskdefinition) { loader.load(streamfile, newerrorcallback, task.destinationtable, processingtaskid); } if (!errorreported) transaction.complete(); } i'm sure there no transactionscope started ahead or after code. i'm using entity framework insert in db. regardless state of errorreported transaction never rolled in case of error. what missing ? transactionscope sets transaction.current . that's does. wants transacted must @ property. i believe ef each time connection opened reason. probably, connection open when scope installed. open connection inside of scope or enlist manually. ef has nasty "design decision": default opens
Read more