Variable groups inherit immutable groups, add, delete, change, search, replace

#define NSLOG (FORMAT, ...) fprintf (stderr, "%s\n", [[NSString Stringwithformat:format, # #__VA_ARGS__] utf8string]);

#import <Foundation/Foundation.h>

int main (int argc, const char * argv[]) {

@autoreleasepool {

Variable groups inherit immutable groups

1, create. Set the number of elements to create

Nsmutablearray *arr=[nsmutablearray Arraywithcapacity:7];

2. Add an element to the array

Nsarray *[email protected][@ "Mon", @ "Tue", @ "Wed", @ "Thu", @ "Fri", @ "sat", @ "Sun"];//immutable variable group

Nsmutablearray *arr2=[nsmutablearray arraywitharray:arr1];//Create a mutable array to copy the immutable group arr1 to ARR2

[Arr2 addobject:@ "Eig"];

for (id str in ARR2)

{

NSLog (@ "%@", str);

}

NSLog (@ "\ n");

3. Insert the element according to the specified subscript

[Arr2 insertobject:@ "Nine" atindex:8];

for (id str in ARR2)

{

NSLog (@ "%@", str);

}

NSLog (@ "\ n");

4. Delete the last element in the array

[Arr2 Removelastobject];

NSLog (@ "%@", arr2);

NSLog (@ "\ n");

5. Delete the element according to the specified subscript

[Arr2 Removeobjectatindex:7];

NSLog (@ "%@", arr2);

NSLog (@ "\ n");

6. Delete elements according to the specified object

[Arr2 removeobject:@ "Sun"];

NSLog (@ "%@", arr2);

NSLog (@ "\ n");

7. Replace the element with the specified subscript

[Arr2 replaceobjectatindex:0 withobject:@ "Sun"];

NSLog (@ "%@", arr2);

NSLog (@ "\ n");

}

return 0;

}

Variable groups inherit immutable groups, add, delete, change, search, replace