At least for the third question (char a = ' ' * 13;) XCode warns "Implicit conversion from 'int' to 'char' changes value from 416 to -96". And for the fifth (r

At least for the third question (char a = ' ' * 13;) XCode warns "Implicit conversion from 'int' to 'char' changes value from 416 to -96". And for the fifth (return i++ + ++i;) it warns "Multiple unsequenced modifications to 'i'". I would not skip those warnings.