Structures
In C structures defined using the struct keyword are a very important concept as they allow for grouping of elements very similarly to classes in other languages they just don't include functions.for example a date, month, day, year. can then create variables as type struct date. memory is allocated 3 variables inside. can access member variables with . so today.year for example. can also assign initil.compound literal can assign values after initilation like (struct date) {1,2,3} or specify the specific values with .month=9for only one time thing. can initialize structs like arrays with {7,2,2015}. or just the frist 2 or can do {.month=12}