IOS Nsmutablearray Usage

#import  <foundation/foundation.h>int main (int argc, const char * argv [])  {     @autoreleasepool  {        // nsmutablearray  variable arrays   inheritance and   immutable nsarray        // Nsmutablearray can create a mutable array object with all the methods of nsarray          //         NSMutableArray *arr = [[NSMutableArray alloc]  initwithobjects:@ "C", @ "C", @ "OC", @ "UI", @ "NET", nil];                //Increase add /insert   Delete remove   change  replace   exchange        [arr addobject:@ "QQQQQQ"];//add element to array          nslog (@ "before:%@", arr);         //adds an element at the end of the &NBSP;&NBSP;&NBSP;&NBsp;    //[arr addobject:@ "Project"];        / /Insert         //[arr insertobject:@ "project" in the specified location  atIndex:1];         //[arr removeallobjects];//Delete all          //Delete Last         //[arr removeLastObject];         //Delete the         //[of the specified index arr removeobjectatindex:0];        //Delete the specified element   have a few deletions          //[arr removeobject:@ "C"];                 //Replacement          //[arr replaceobjectatindex:0 withobject:@ "C"];         [arr exchangeobjectatindex:0 withobjectatindex:3];                 nslog (@ "after:%@", arr),         //variable space   will increase   decrease as data increases                &NBSP;&NBSP;//Fast enumeration   only   reading group elements   cannot change the array                  /*          Fast Enumeration, At this point there will be an enumerator   and   the current array to establish an association, through this association to iterate over the array, the traversal of a modified monitor (iterator), to monitor whether the array has been modified, if once modified immediately crash  crashes out           */        for  (NSString  *str in arr)  {                         //[arr exchangeobjectatindex:3  withobjectatindex:4]; &nBsp;          //nslog (@ "%@", [arr objectatindex:0]);         }                             }     return 0;}

IOS Nsmutablearray Usage