Use of NSNumber in iOS (Objective C)

#import <Foundation/Foundation.h>

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

    @autoreleasepool {

        NSNumber *aBool=[NSNumber numberWithBool:NO];

        NSNumber *aChar=[NSNumber numberWithChar:'z'];

        NSNumber *anInt=[NSNumber numberWithInt:234545];

        NSNumber *aDouble=[NSNumber numberWithDouble:34.345];

        

        NSLog(@ "%@",[aBool boolValue]?@ "YES":@ "NO");

        NSLog(@ "%c",[aChar charValue]);

        NSLog(@ "%lu",[anInt integerValue]);

        NSLog(@ "%f",[aDouble doubleValue]);

        

        //Assigning direct literals is valid.

        aBool=@ YES;

        NSLog(@ "%@",[aBool boolValue]?@ "YES":@ "NO");

        

        //NSNumber could be used directly with any data type.

        float x=5;

        NSNumber *result=@(x*10);

        NSLog(@ "%@",result);

        

        //could also be used in counter to store value at runtime.

        NSNumber *counter=@ 0;

        for (int i=0; i<10; i++) {

            counter=@ ([counter integerValue]+1);

        }

        NSLog(@ "%@",counter);

        

        //Use of NSNumber with NSComparisonResult

        NSNumber *anInteger=@ 65;

        NSNumber *anotherInt=@ 42;

        NSComparisonResult result1 = [anInteger compare:anotherInt];

        if (result1 == NSOrderedAscending) { //It will return 1 if true.

            NSLog(@ "65<42");

        }

        else if (result1 == NSOrderedSame){ //It will return 0 if true.

            NSLog(@ "65==42");

        }

        else if (result1 == NSOrderedDescending){ //It will return -1 if true.

            NSLog(@ "65>42");

        }

    }

    return 0;

}