Basic Objective-C Pointer Question

Question

#import <Foundation/Foundation.h>

BOOL areIntsDifferent( int thing1, int thing2 ) {
    if (thing1 == thing2) {
        return (NO);
    } else {
        return (YES);
    }
}

NSString *boolString (BOOL yesNo) {
    if (yesNo == NO) {
        return( @"NO" );
    } else {
        return( @"YES" );
    }
}

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

    areTheyDifferent = areIntsDifferent (5,5);

    NSLog(@"are %d and %d different? %@", 5, 5, boolString(areTheyDifferent));

    areTheyDifferent = areIntsDifferent (23,42);

    NSLog(@"are %d and %d different? %@", 23, 42, boolString(areTheyDifferent));

    return (0);
}

This is the whole program. This is not terribly complicated, but it illuminates the general problem that I am facing is understanding pointers. In this situation, is the return value of the boolString function a pointer because there is no memory allocated to hold the string? And if so, why is notIntsDifferent returns a pointer value to a BOOL value? Is it possible to rewrite this program so that the return value of boolString is a string and not a pointer to a string? If yes, how? I tried to fix *, but then I got a compiler error.

Answer 1

NSString - . Obj-C , .

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Answer 2

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isIntDifferent BOOL?

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