Competitive VEX Robot Designer. Terminal Objective 5.2: program functions to accept values

Transcription

1 Skill Set 5: Programmer II Competitive VEX Robot Designer Terminal Objective 5.2: program functions to accept values Performance Objective: Using an ultrasonic range sensor and optical quad encoder, program a function that will accept a value of the ultrasonic range sensor, compare the value to the optical quad encoder value and adjust the encoder value to stop at a distance from the wall. Enabling Objectives: 1. describe how functions pass values 2. describe the benefit of passing values in functions 3. create code to pass values to a function Laboratory Hardware: The following materials and hardware are required and unique to this lesson: Modified VEX Protobot easyc V4 for Cortex Learning Activities: 1. View PowerPoint presentation and complete Activity Sheet 5.2 Program Functions to Accept Values. Formative Evaluation: Activity Sheet 5.2, Program Functions to Accept Values will be used to assess student progress. The answers to Activity Sheet 2.3 are as follows: Matching 1. B 2. F 3. C 4. D 5. A 6. D 7. A Developed by Trevor Robinson Lesson 5.2 page 1

2 Short Answer 8. Void wheel(encoder) { A = encoder; } 9. wheel(encoder); 10. The benefits of a function can be readability, usability, and neatness. 11. Instead of voiding the or leaving the () on the right side of the function call, place the value you wish to pass. 12. Cannot pass values in subroutines Summative Evaluation: Performance Assessment 5.2, Program Functions to Accept Values will be used to measure the performance objective. In addition, the following test items could be used to measure the enabling and terminal objectives on a unit or end-oflevel test: 1. What is the correct function header to only accept a passed variable? A. Void Ultrasonic(void); B. Void Ultrasonic(int a); C. int Ultrasonic(int a); D. Int int ultrasonic(int a); 2. Which can be a benefit of accepting values in functions? A. Code storage B. Code reusability C. Less variable usage D. Aligns memory sequentially 3. How does a function pass a value? A. by allocating a space in memory for the variable to be passed B. the program automatically remembers the exact location and value of the variable C. the function has build in memory so you don t have to be concerned D. by allocation of memory that is built into the function Developed by Trevor Robinson Lesson 5.2 page 2

3 4. Which of the following is a good example of a function header that can accept a value? A. Void Drive(int a) B. Drive(a) C. Call Drive(a) D. int Drive(int) Developed by Trevor Robinson Lesson 5.2 page 3

4 Performance Assessment 5.2 Name: Start Date: Skill Set: Driver/Operator Terminal Objective 5.2: program functions to accept values Performance Objective: Using an ultrasonic range sensor and optical quad encoder, program a function that will accept a value of the ultrasonic range sensor, compare the value to the optical quad encoder value and adjust the encoder value to stop at a distance from the wall. Performance Assessment Elements Acceptable Unacceptable 1. Robot traverses the course a) Robot stops at a given distance 2. Function operations a) Functions are named for their task b) One function passes a value Note: All items must receive an acceptable rating to pass the objective. Evaluator: Date: Developed by Trevor Robinson Lesson 5.2 page 4

5 Activity Sheet 5.2 Program Functions to Accept Values Name: Date: Directions: Match the description or purpose of the items in the left column with the best selection from the list of items in the right column by writing the corresponding letter in the space provided. 1. Code that demonstrates a function call with a value to pass 2. A benefit passing a value in a function 3. Function Header code that demonstrates a function call to pass a value 4. Example code of a function call with a value to pass A. Function B. Drive(a); C. Void Drive(int a) D. Pass 8. A function can do this do a value 7. To allow a program to use less code, pass a value through a: E. Storage F. Code reusability G. For passing values H. int Drive(int a) I. int Drive(void) Short Answer Directions: Write your answer in the space provided. 8. Create code that demonstrates a function that can accept a value? Developed by Trevor Robinson Lesson 5.2 page 5

6 9. Create code that will initiate a function call from the function autonomous that will pass a variable. 10. List one benefit of accepting values in functions? Developed by Trevor Robinson Lesson 5.2 page 6