Booleans and Auto

Booleans and Auto

The Bool Type

HolyC has a Bool type (capital B) with two constants: TRUE and FALSE.

Bool is_ready = TRUE;
Bool is_done  = FALSE;

Internally, Bool is an integer: TRUE is 1 and FALSE is 0. You can print booleans with %d:

Bool flag = TRUE;
Print("%d\n", flag);  // prints: 1

Using Booleans in Conditions

Booleans work naturally in if statements:

Bool found = TRUE;
if (found) {
  Print("Found it!\n");
}

Bool empty = FALSE;
if (!empty) {
  Print("Not empty\n");
}

Auto Type Inference

The auto keyword lets the compiler infer the type from the initializer — similar to var in other languages:

auto count = 42;         // inferred as I64
auto message = "hello";  // inferred as U8* (string pointer)
auto ratio = 3.14;       // inferred as F64

auto is useful when the type is obvious from context and you want to avoid repetition.

Your Task

Declare a Bool variable logged_in = TRUE and an auto variable username = "terry".

If logged_in is true, print: Welcome, terry

Otherwise print: Access denied