The learner will review code and answer questions about the while command.
While Command
All the flashcards in this set deal with the code below:
const int Pressuresensor = 0;
const int PressureLed = 9;
const int CalibrateLedPin = 13;
const int pushbuttonPin = 2;
int sensorMin = 1023;
int sensorMax = 0;
int sensorValue = 0;
void setup()
{
pinMode(CalibrateLedPin, OUTPUT);
pinMode(PressureLed, OUTPUT);
pinMode(pushbuttonPin, INPUT);
}
void calibrate()
{
digitalWrite(CalibrateLedPin, HIGH);
sensorValue = analogRead(Pressuresensor);
if (sensorValue > sensorMax)
sensorMax = sensorValue;
if (sensorValue < sensorMin)
sensorMin = sensorValue;
}
void main()
{
while (digitalRead(pushbuttonPin) == HIGH)
{
calibrate();
}
digitalWrite(CalibrateLedPin, LOW);
sensorValue = analogRead(Pressuresensor);
sensorValue = map(sensorValue, sensorMin, sensorMax, 0, 255);
analogWrite(PressureLed, sensorValue);
}
This code is displayed in the image below, which will be on each card, but you may want to make note of it before going on.
Question 1 of 10
While Command
Correct!
All the flashcards in this set deal with the code below:
const int Pressuresensor = 0;
const int PressureLed = 9;
const int CalibrateLedPin = 13;
const int pushbuttonPin = 2;
int sensorMin = 1023;
int sensorMax = 0;
int sensorValue = 0;
void setup()
{
pinMode(CalibrateLedPin, OUTPUT);
pinMode(PressureLed, OUTPUT);
pinMode(pushbuttonPin, INPUT);
}
void calibrate()
{
digitalWrite(CalibrateLedPin, HIGH);
sensorValue = analogRead(Pressuresensor);
if (sensorValue > sensorMax)
sensorMax = sensorValue;
if (sensorValue < sensorMin)
sensorMin = sensorValue;
}
void main()
{
while (digitalRead(pushbuttonPin) == HIGH)
{
calibrate();
}
digitalWrite(CalibrateLedPin, LOW);
sensorValue = analogRead(Pressuresensor);
sensorValue = map(sensorValue, sensorMin, sensorMax, 0, 255);
analogWrite(PressureLed, sensorValue);
}
This code is displayed in the image below, which will be on each card, but you may want to make note of it before going on.
Correct Answer
Got it!
Question 1 of 10
While Command
Incorrect
All the flashcards in this set deal with the code below:
const int Pressuresensor = 0;
const int PressureLed = 9;
const int CalibrateLedPin = 13;
const int pushbuttonPin = 2;
int sensorMin = 1023;
int sensorMax = 0;
int sensorValue = 0;
void setup()
{
pinMode(CalibrateLedPin, OUTPUT);
pinMode(PressureLed, OUTPUT);
pinMode(pushbuttonPin, INPUT);
}
void calibrate()
{
digitalWrite(CalibrateLedPin, HIGH);
sensorValue = analogRead(Pressuresensor);
if (sensorValue > sensorMax)
sensorMax = sensorValue;
if (sensorValue < sensorMin)
sensorMin = sensorValue;
}
void main()
{
while (digitalRead(pushbuttonPin) == HIGH)
{
calibrate();
}
digitalWrite(CalibrateLedPin, LOW);
sensorValue = analogRead(Pressuresensor);
sensorValue = map(sensorValue, sensorMin, sensorMax, 0, 255);
analogWrite(PressureLed, sensorValue);
}
This code is displayed in the image below, which will be on each card, but you may want to make note of it before going on.
Your Answer
Correct Answer
Got it!
Question 1 of 10
While Command
Question 1 of 10
While Command
Correct!
True or False: The calibrate function is called when digitalRead(pushbuttonPin) is HIGH.
Correct Answer
True
In the main section of code, the calibrate function is called exactly when digitalRead(pushbuttonPin) is HIGH.
Question 1 of 10
While Command
Incorrect
True or False: The calibrate function is called when digitalRead(pushbuttonPin) is HIGH.
Your Answer
Correct Answer
True
In the main section of code, the calibrate function is called exactly when digitalRead(pushbuttonPin) is HIGH.
Question 1 of 10
While Command
True or False: If the while statement were changed to read
while !(digitalRead(pushbuttonPin) == HIGH), a HIGH pushbuttonPin would cause the calibrate function to be called.
Question 1 of 10
While Command
Correct!
True or False: If the while statement were changed to read
while !(digitalRead(pushbuttonPin) == HIGH), a HIGH pushbuttonPin would cause the calibrate function to be called.
Correct Answer
False
The ! in front of (digitalRead(pushbuttonPin) == HIGH) actually takes the negation of the value, so if
(digitalRead(pushbuttonPin) == HIGH) is true,
!(digitalRead(pushbuttonPin) == HIGH) will be false and the while command will not execute its code.
Question 1 of 10
While Command
Incorrect
True or False: If the while statement were changed to read
while !(digitalRead(pushbuttonPin) == HIGH), a HIGH pushbuttonPin would cause the calibrate function to be called.
Your Answer
Correct Answer
False
The ! in front of (digitalRead(pushbuttonPin) == HIGH) actually takes the negation of the value, so if
(digitalRead(pushbuttonPin) == HIGH) is true,
!(digitalRead(pushbuttonPin) == HIGH) will be false and the while command will not execute its code.
Question 1 of 10
While Command
As the program is written, how many times will calibrate be called?
Question 1 of 10
While Command
Correct!
As the program is written, how many times will calibrate be called?
Correct Answer
depends how long the push button is pressed
calibrate() will run if digitalRead(pushbuttonPin) is HIGH, but when it is done running and the program returns to the while statement, if digitalRead(pushbuttonPin) is still HIGH, it will run calibrate() again.
Question 1 of 10
While Command
Incorrect
As the program is written, how many times will calibrate be called?
Your Answer
Correct Answer
depends how long the push button is pressed
calibrate() will run if digitalRead(pushbuttonPin) is HIGH, but when it is done running and the program returns to the while statement, if digitalRead(pushbuttonPin) is still HIGH, it will run calibrate() again.
Question 1 of 10
While Command
True or False: The following line of code is executed while the push button is pressed analogWrite(PressureLed, sensorValue);.
Question 1 of 10
While Command
Correct!
True or False: The following line of code is executed while the push button is pressed analogWrite(PressureLed, sensorValue);.
Correct Answer
False
That code is not written until after the while loop has ended, meaning that it will not be executed until the button is no longer being pressed.
Question 1 of 10
While Command
Incorrect
True or False: The following line of code is executed while the push button is pressed analogWrite(PressureLed, sensorValue);.
Your Answer
Correct Answer
False
That code is not written until after the while loop has ended, meaning that it will not be executed until the button is no longer being pressed.
Question 1 of 10
While Command
True or False: Since only one line of code is executed by the while loop in this example, the while loop body curly brackets could be removed with no change to the program functionality.
Question 1 of 10
While Command
Correct!
True or False: Since only one line of code is executed by the while loop in this example, the while loop body curly brackets could be removed with no change to the program functionality.
Correct Answer
True
If the while command is used without any curly brackets, it will execute (exactly) the next line of code if its condition is met, so removing them in this instance would produce the same program behavior.
Question 1 of 10
While Command
Incorrect
True or False: Since only one line of code is executed by the while loop in this example, the while loop body curly brackets could be removed with no change to the program functionality.
Your Answer
Correct Answer
True
If the while command is used without any curly brackets, it will execute (exactly) the next line of code if its condition is met, so removing them in this instance would produce the same program behavior.
Question 1 of 10
While Command
If we changed the while condition to be while (pushbuttonPin = HIGH), how many times will the while loop execute?
Question 1 of 10
While Command
Correct!
If we changed the while condition to be while (pushbuttonPin = HIGH), how many times will the while loop execute?
Correct Answer
forever
Because there is only one =, the place in our while command that should have a comparison has an assignment instead. This will cause the while loop to run forever because the value of pushbuttonPin will be set to HIGH which is TRUE, so the comparison will always be true.
Question 1 of 10
While Command
Incorrect
If we changed the while condition to be while (pushbuttonPin = HIGH), how many times will the while loop execute?
Your Answer
Correct Answer
forever
Because there is only one =, the place in our while command that should have a comparison has an assignment instead. This will cause the while loop to run forever because the value of pushbuttonPin will be set to HIGH which is TRUE, so the comparison will always be true.
Question 1 of 10
While Command
Which line(s) of code are executed in this example if the button is pressed?
while (digitalRead(pushbuttonPin) == HIGH)
calibrate();
digitalWrite(CalibrateLedPin, LOW);
Question 1 of 10
While Command
Correct!
Which line(s) of code are executed in this example if the button is pressed?
while (digitalRead(pushbuttonPin) == HIGH)
calibrate();
digitalWrite(CalibrateLedPin, LOW);
Correct Answer
calibrate();
Since there are no curly brackets after the while command, only the next line of code will execute as long as the condition is true.
Question 1 of 10
While Command
Incorrect
Which line(s) of code are executed in this example if the button is pressed?
while (digitalRead(pushbuttonPin) == HIGH)
calibrate();
digitalWrite(CalibrateLedPin, LOW);
Your Answer
Correct Answer
calibrate();
Since there are no curly brackets after the while command, only the next line of code will execute as long as the condition is true.
Question 1 of 10
While Command
Question 1 of 10
While Command
Correct!
Is the while command a pre or post entry conditional test?
Correct Answer
Pre
The while command is preconditional.
Question 1 of 10
While Command
Incorrect
Is the while command a pre or post entry conditional test?
Your Answer
Correct Answer
Pre
The while command is preconditional.
Question 1 of 10
While Command
Which line(s) of code are executed in this example if the button is pressed?
while(digitalRead(pushbuttonPin) == HIGH)
{
calibrate();
digitalWrite(CalibrateLedPin, LOW);
}
Question 1 of 10
While Command
Correct!
Which line(s) of code are executed in this example if the button is pressed?
while(digitalRead(pushbuttonPin) == HIGH)
{
calibrate();
digitalWrite(CalibrateLedPin, LOW);
}
Correct Answer
calibrate();
digitalWrite(CalibrateLedPin, LOW);
Since the statements after the while command are in curly brackets, both lines will be executed when the comparison is true.
Question 1 of 10
While Command
Incorrect
Which line(s) of code are executed in this example if the button is pressed?
while(digitalRead(pushbuttonPin) == HIGH)
{
calibrate();
digitalWrite(CalibrateLedPin, LOW);
}
Your Answer
Correct Answer
calibrate();
digitalWrite(CalibrateLedPin, LOW);
Since the statements after the while command are in curly brackets, both lines will be executed when the comparison is true.
Question 1 of 10
While Command
True or False: While commands may run indefinately if the conditional never becomes false.
Question 1 of 10
While Command
Correct!
True or False: While commands may run indefinately if the conditional never becomes false.
Correct Answer
True
A while command can run indefinitely if its conditional is true.
Question 1 of 10
While Command
Incorrect
True or False: While commands may run indefinately if the conditional never becomes false.
Your Answer
Correct Answer
True
A while command can run indefinitely if its conditional is true.
Question 1 of 10
Score
You have answered 5 of 10 questions correctly.
50%
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While Command by Fox Valley Technical College is licensed under a Creative Commons Attribution 3.0 Unported License.