// K&R C:
char string[6] = "hello";  // Initializes string[] to "hello\0".
char chars[5]  = "hello";  // ERROR at compile-time.

// ANSI C:
char string[6] = "hello";  // Initializes string[] to "hello\0".
char chars[5]  = "hello";  // Initializes chars[]  to "hello".
char bad[4]    = "hello";  // ERROR. Only a trailing nul can be cut.

// Not the same.
char a1[6] = "hello";
char *a2   = "hello";

a1[0] = 'H';       // OK
a2[0] = 'H';       // ERROR


a1 = "Greetings";  // ERROR
a2 = "Greetings";  // OK