Immutable dictionary assignment How many in the dictionary get all the values for all value values in the dictionary

#import <Foundation/Foundation.h>

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

@autoreleasepool {

/* Dictionary: Nsdictionary

The difference between the array used to store the data: The dictionary uses key-value methods, unordered

2 is the equivalent of using a dictionary to find specific words in a directory

3 in the form of Key-value data, value is used to store data, key to retrieve data

4 dictionary in Cocoa: variable/non-variable

Attention:

1.key is usually a string object and can be any type

2. The same key is not allowed in the dictionary, allowing the same value

*/

Immutable dictionaries

Assigned value 1

NSNumber *num=[nsnumber numberwithint:100];

Nsdictionary *dic=[nsdictionary dictionarywithobject:num forkey:@ "Monry"];

NSLog (@ "%@", DIC);

Assignment 2 Jay is k name is value

Nsdictionary *dics=[nsdictionary dictionarywithobjectsandkeys:@ "Jay", @ "name", @ "@", @ "age", @ "F", @ "gender", nil];

NSLog (@ "%@", dics);

Assigned value 3

Nsdictionary *[email protected]{@ "name": @ "Jay",

@ "Age": @ "23",

@ "Gender": @ "M"

};

Nsdictionary *dicd=[nsdictionary DICTIONARYWITHDICTIONARY:DICF];

NSLog (@ "%@", DICD);

Key-value, how many are there?

Nsinteger Count=[dicd Count];

NSLog (@ "%ld", count);

Gets the value in the dictionary

NSString *name=[dicd objectforkey:@ "name"];

NSLog (@ "%@", name);

Get all the values in the dictionary

Nsarray *arr=[dicd allvalues];

NSLog (@ "%@", arr);

Get all the keys in the dictionary

Nsarray *arra=[dicd AllKeys];

for (id str in ARRA) {

NSLog (@ "%@", str);

};

}

return 0

}

Immutable dictionary assignment How many in the dictionary get all the values for all value values in the dictionary