The data type I hate the most is char, coz that's what you use to create a string in C. Unlike other languages like python and JavaScript, C doesn't have the string data type, you will have to create an array of characters to represent a string which can be a serious pain in the neck because you will have to deal with allocating and reallocating memory. C is a great language for learning the basics of programming but having to deal with memory management can be very frustrating sometimes, thank God other languages took care of that problem on their own