0x0d2c May your signals all trap May your references be bounded All memory aligned Floats to ints rounded Remember ... Non-zero is true ++ adds one Arrays start with zero and, NULL is for none For octal, use zero 0x means hex = will set == means test use -> for a pointer a dot if its not ? : is confusing use them a lot a.out is your program there's no U in foobar and, char (*(*x())[])() is a function returning a pointer to an array of pointers to functions returning char