iphone - Condition always fails though the comparative values seems correct in iOS -


when check value of number in nslog shows '0' 

    nsmutabledictionary *data = [[nsmutabledictionary alloc] initwithcontentsoffile: path];     nsnumber *number=[data objectforkey:@"serial"];     nslog(@"%@",number);     if(number ==0 )     {          imgbutton.hidden=yes;     }

but condition fails , changed code 

     nsstring *number=[data objectforkey:@"serial"]      nslog(@"%@",number);      if(number == @"0" )      {            imgbutton.hidden=yes;      }

but here condition fail ,what issue this?

in first code checking nsnumber, object, against int. correct check is:

if([number intvalue] == 0) {     imgbutton.hidden = yes; }

in second code checking 2 nsstring, have use "isequaltostring" method , not "==". correct code is:

if([number isequaltostring:@"0"]) {     imgbutton.hidden = yes; }

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