if(i== x || i == y || i == z )

if (i == ( x || y || z ))

switch (i) {
    case x:
    case y:
    case z:
        ....some code....
        break
    default:
        ....some other code....
}

NSArray *matchingNumbers = @[@1,@2,@3,@4,@5,@6,@7,@8];
    NSNumber *checkedNumber = @3;
    if ( [matchingNumbers indexOfObject:checkedNumber] != NSNotFound)
    {
        //...
    }

if ([myArray containsObject:i]) {

n = 0;
while (n<49) {
    if (n==[myArray objectAtIndex:n]) {
        //OR statement returned true for one of the 50 objects...
    }
}

if ((i==x)||(i==y)) {
     string=@"hello";
}

string = ((i==x)||(i==y)) ? @"hello";

if ((i==x)||(i==y)) {
     string=@"hello";
} else {
     string=@"goodbye";
}

string = ((i==x)||(i==y)) ? @"hello" : @"goodbye";

myNumber = ((i==x)||(i==y))*(z+w);

if ([[[NSMutableArray alloc] initWithObjects:x,y,z,a,b,c,d,e,f,g,h,j,k,l,nil] containsObject:i]) {