Swap 2 values without third variable


- (void)viewDidLoad
{
    int x,y;

    x = 5;
    y = 10;

    NSLog(@"Before x: %d",x);
    NSLog(@"Before y: %d",y);

    x = x + y;
    y = x - y;
    x = x - y;
 
    NSLog(@"After x: %d",x);
    NSLog(@"After y: %d",y);
}

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