Question

I created simple NSObject class to take some values. My application has not come any error when I run and build the application. I tried it lot of time to run program. I am beginner of the objective c.

Code ::

#import "FibonachiNo.h"

@implementation FibonachiNo

- (NSArray *) fibonacci:(NSInteger) n {

    NSMutableArray *fib = [NSMutableArray array];

    int a = 0;
    int b = 1;
    int sum;
    int i;

    for (i=0; i<=n; i++)
    {
        [fib addObject:[NSNumber numberWithInt:a]];
        sum = a + b;
        a = b;
        b = sum;
    }

    return (NSArray *) fib;
}

- (NSInteger) factorial:(NSInteger) n {
    if ( n <= 1 )
        return 1;
    else
        return n * [self factorial:( n-1 )];
}

@end

My application header class

#import <UIKit/UIKit.h>
#import "FibonachiNo.h"
@interface ViewController : UIViewController
@property FibonachiNo *myFibonachi;
@end

Calling Method to NSObject Class ::

  NSLog(@"fibonacci for 10 = %@", [myFibonachi fibonacci:10]);
  NSLog(@"10! = %d",[myFibonachi factorial:10]);

Is it any wrong in this calling method ?

Answer 1

first alloc init your Array

#import "FibonachiNo.h"

@implementation FibonachiNo

- (NSArray *) fibonacci:(NSInteger) n {

    NSMutableArray *fib = [NSMutableArray alloc]init];

    int a = 0;
    int b = 1;
    int sum;
    int i;

    for (i=0; i<=n; i++)
    {
        [fib addObject:[NSNumber numberWithInt:a]];
        sum = a + b;
        a = b;
        b = sum;
    }

    return fib;
}

- (NSInteger) factorial:(NSInteger) n {
    if ( n <= 1 )
        return 1;
    else
        return n * [self factorial:( n-1 )];
}

@end

Calling Method to NSObject Class ::

in ViewDidLoad use following.

FibonachiNo *myFibonachi=[[FibonachiNo alloc]init];
  NSLog(@"fibonacci for 10 = %@", [myFibonachi fibonacci:10]);
  NSLog(@"10! = %d",[myFibonachi factorial:10]);

if still you facing any issue , then show your NSLog output here.