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NQC Program Structure: Tasks, Subroutines, Inline Functions

Learn about the NQC program structure with its three types of code blocks—Tasks, Subroutines, and Inline Functions—and their features. Implement tasks using start and stop commands, define subroutines without local variables, and declare inline functions for efficient code execution. Understand variable declaration, sensor settings, and motor control in NQC programming language.

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NQC Program Structure: Tasks, Subroutines, Inline Functions

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

  2. 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) Tasks

  3. 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 Subroutines

  4. 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 Inline Functions

  5. Argument types

  6. 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 Variables

  7. 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); Sensors

  8. 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 Outputs

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