Question

    NSMutableArray *no1=[[NSMutableArray alloc]init];
    NSMutableArray *no2=[[NSMutableArray alloc]init];

    for(int i=0;i<3;i++)
    {
        for (int j=0;j<=i;j++)
        {
            NSString *no_str=[NSString stringWithFormat:@"%d",j];
            [no1 addObject:no_str];
        }
        [no2 addObject:no1];
        [no1 removeAllObjects];
    }
    NSLog(@"Final:%@",no2);

I got output like:

Final:(
(
0,
1,
2
),
(
0,
1,
2
),
(
0,
1,
2
)
)

But i need output like this:

Final:(
(
0
),
(
0,
1
),
(
0,
1,
2
)
)

Please any one help me.

Answer 1

I assume you are using ARC, so this code will work good.

NSMutableArray *no1;
NSMutableArray *no2=[[NSMutableArray alloc]init];

for(int i=0;i<3;i++)
{
    no1=[[NSMutableArray alloc]init];
    for (int j=0;j<=i;j++)
    {
        NSString *no_str=[NSString stringWithFormat:@"%d",j];
        [no1 addObject:no_str];
    }
    [no2 addObject:no1];
}
NSLog(@"Final:%@",no2);

EDIT: even if you alloc init the no1 the result will be same.