次のコードでは、「No visible @interface for BankAccount declares the selector getAccountNumber」というエラーが表示されます。なぜですか? 助けてください
// BankAccount.h
#import <Foundation/Foundation.h>
@interface BankAccount: NSObject
@property long accountNumber;
@end
// BankAccount.m
#import "BankAccount.h"
@implementation BankAccount
@end
//main.m
#import <Foundation/Foundation.h>
#import "BankAccount.h"
int main (int argc, const char * argv[]) {
BankAccount *account1 = [[BankAccount alloc] init];
[account1 setAccountNumber: 34543212];
NSLog(@" Account No = %li", [account1 getAccountNumber]);
return 0;
}