Types, declarations, variables, literals

Basic types

int n;
char c;
float x;

int a,b,c,d;

int year = 1988;
char field_separator = '\t';
float pi = 3.14159;

Variables can be initialized in a declaration, any constant expression
....may be used.
Character constants delimited by single quotes.

Arrays

int dept[20];

char buffer[100];

int primes[] = { 2, 3, 5, 7, 11, 13, 17, 19 };

float BigMatrix[10][10];

Elements of dept[20] are dept[0] ... dept[19]. Indices always start at
....0. dept[20] doesn't exist, but compiler doesn't catch range errors.

Initial array values delimited by {and }.Compiler will figure out size
....for you.

Multidimensional arrays are simply arrays of arrays of arrays.