1. NQC Program Structure
3 types of code blocks with their own features and limitations
1. Tasks
2. Subroutines
3. Inline Functions

2. Tasks Syntax task name ( ) { //task body }
Example
Program must have task named “main”
Program may have up to 10 tasks
Implement tasks using “start” & “stop” (except “main” task)

3. Subroutines Cannot use arguments Syntax sub name ( ){
//subroutine body }
Single copy of code is shared by different callers (efficient)
Cannot use arguments
Cannot call other subs
8 subs maximum
No local variables- called from multiple tasks
Mostly used when code size is limited

4. Inline Functions Syntax void name (arguments) { //Function body }
Leads to excessive code size (each call adds copy)
“return” causes function to return
Arguments
Empty, one, more
Correct number & type
Defined by “type” followed by “name”
example

5. Argument types TYPE MEANING LIMITATION int Pass by value none
const int
Constants only
int&
Pass by reference
Variables only
const int&
Cannot modify argument

6. Variables 16 bit signed integers Max 32 variables
Declared & initialized same as in Java
Global variables declared outside block
Local variables accessible inside block where defined
Example:
int x; // global task main ( ) { int y; // local to main {// compound stment int z; // local to cmpd y = z; // valid asgmnt } y = z; // error- z not in scope

7. Sensors SENSOR_1, 2, or 3 identifies RCX sensor ports
You can set the type and the mode for each sensor
For convenience just use SetSensor
Examples:
SetSensorType (SENSOR_1, SENSOR_TYPE_LIGHT);
SetSensorMode(SENSOR_1, SENSOR_MODE_PERCENT);
SetSensor(SENSOR_1, SENSOR_LIGHT);

8. Outputs Out_A, B, or C identifies output ports 3 attributes: Mode
On, Off , Float
Direction
Fwd,Rev, Toggle
Power level
SetPower(Out_A,7)
Examples:
OnFwd(Out_A);
Rev (Out_B);
Off(Out_A+Out_B);
OnFor(Out_C,100);
MISC
Wait(time);
time = 100ths sec