Why should you be careful about opening a file for write operations? if the file already exists, you will generate a syntax error. if the file already exists, the existing file will be replaced by the new file. if the file already exists, your data will be added to the existing file. if the file already exists, you will have two files with the same name!

the major difference between the two is the objective and the reward of the game. candy crush has a puzzle theme with the objective of meeting a specific quota of points or objects, you are able to gain access to the next level and compete with peers on the process. on duolingo the objective is rather different, you are given sets of questions for you to answer for you to move to the next level and as for the reward, you are able to learn available language as this is an app developed to teach the user about other languages.