how to use #define macro

//Sept 22 2013
//transform.xcodeproj
//OS X 10.6.8
//Xcode 4.2, Build 4C199

//example of using a define and a define with MACRO argument

#import <Foundation/Foundation.h>

//this is a straigthforward text substitution:
#define TRANSITION "Therefore"
//this one takes an argument to test if one number is smaller than another
//and to return the smallest - see how its employed in the first printf statement below
#define MINY(a,b) ((a)<(b)) ? (a) : (b)


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

    @autoreleasepool {
        int her = 31;
        int you = (3*1)+her;
        int me = 3*(1+her);

        //here's the macro employed to print the numbers
        printf("\n%i %s %i", MINY(me, you), ((!(me == you)) ? "is smaller than" : "equals"), (((MINY(me, you)) == me) ? you : me));

        //now we use another conditional to identify which value belonged to which variable
        if (me < you)
            //and here's the other #define statement:
            printf("\n%s, me is smaller than you.", TRANSITION);
        else if (me > you)
            printf("\n%s, you is smaller than me.", TRANSITION);
        else
            printf("\n%s, you and me are equal.", TRANSITION);

    }
    return 0;
}