russianDeclension obj-c

+ (NSString*) russianDeclensionForNum:(NSInteger)num one:(NSString*)one two:(NSString*)two five:(NSString*)five {
    return [NSString russianDeclensionForStr:[NSString stringWithFormat:@"%d", num] one:one two:two five:five];
}

+ (NSString*) russianDeclensionForStr:(NSString*)str one:(NSString*)one two:(NSString*)two five:(NSString*)five {
    NSString *res = nil;
    if ([str hasSuffix:@"1"] && ![str hasSuffix:@"11"]) {
        res = [NSString stringWithFormat:@"%@ %@", str, one];
    } else if([str hasSuffix:@"11"]
            || [str hasSuffix:@"12"]
            || [str hasSuffix:@"13"]
            || [str hasSuffix:@"14"]) {
        res = [NSString stringWithFormat:@"%@ %@", str, five];
    } else if ([str hasSuffix:@"2"] || [str hasSuffix:@"3"] || [str hasSuffix:@"4"]) {
        res = [NSString stringWithFormat:@"%@ %@", str, two];
    } else if ([str hasSuffix:@"0"]
             || [str hasSuffix:@"5"]
             || [str hasSuffix:@"6"]
             || [str hasSuffix:@"7"]
             || [str hasSuffix:@"8"]
             || [str hasSuffix:@"9"]) {
        res = [NSString stringWithFormat:@"%@ %@", str, five];
    } else {
        res = str;
    }
    return res;
}