The learner will review code and answer questions about an if else statement.
Conditional If Else Statements
All the flashcards in this set deal with the following code:
/*Assume a temperature sensor is connected to the analog pin and an alarm is connected to the digital output*/
const int tempPin = 1;
const int alarmPin = 0;
const int tempthreshold = 200;
int analogValue;
void setup()
{
pinmode(alarmPin, OUTPUT);
Serial.begin(9600);
}
void main()
{
analogValue = analogRead(tempPin);
if (analogValue > tempthreshold)
{
digitalWrite(alarmPin, HIGH);
}
else
{
digitalWrite(alarmPin, LOW);
}
Serial.println(analogValue);
}
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
Conditional If Else Statements
Correct!
All the flashcards in this set deal with the following code:
/*Assume a temperature sensor is connected to the analog pin and an alarm is connected to the digital output*/
const int tempPin = 1;
const int alarmPin = 0;
const int tempthreshold = 200;
int analogValue;
void setup()
{
pinmode(alarmPin, OUTPUT);
Serial.begin(9600);
}
void main()
{
analogValue = analogRead(tempPin);
if (analogValue > tempthreshold)
{
digitalWrite(alarmPin, HIGH);
}
else
{
digitalWrite(alarmPin, LOW);
}
Serial.println(analogValue);
}
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
Conditional If Else Statements
Incorrect
All the flashcards in this set deal with the following code:
/*Assume a temperature sensor is connected to the analog pin and an alarm is connected to the digital output*/
const int tempPin = 1;
const int alarmPin = 0;
const int tempthreshold = 200;
int analogValue;
void setup()
{
pinmode(alarmPin, OUTPUT);
Serial.begin(9600);
}
void main()
{
analogValue = analogRead(tempPin);
if (analogValue > tempthreshold)
{
digitalWrite(alarmPin, HIGH);
}
else
{
digitalWrite(alarmPin, LOW);
}
Serial.println(analogValue);
}
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
Conditional If Else Statements
Question 1 of 10
Conditional If Else Statements
Correct!
True or False: The alarm will come on if the analog input value is 150.
Correct Answer
False
The alarm will only be turned on if analogValue > tempthreshold. If the value read is 150, then analogValue > tempthreshold is 150 > 300, which is false. Therefore, the else code will run.
Question 1 of 10
Conditional If Else Statements
Incorrect
True or False: The alarm will come on if the analog input value is 150.
Your Answer
Correct Answer
False
The alarm will only be turned on if analogValue > tempthreshold. If the value read is 150, then analogValue > tempthreshold is 150 > 300, which is false. Therefore, the else code will run.
Question 1 of 10
Conditional If Else Statements
True or False: The analogValue > tempthreshold condition of the if statement must be true in order for the alarm to be activated.
Question 1 of 10
Conditional If Else Statements
Correct!
True or False: The analogValue > tempthreshold condition of the if statement must be true in order for the alarm to be activated.
Correct Answer
True
The only place we turn on the alarm, digitalWrite(alarmPin, HIGH), is within the code of the if statement. The if statement will only execute its code when analogValue > tempthreshold.
Question 1 of 10
Conditional If Else Statements
Incorrect
True or False: The analogValue > tempthreshold condition of the if statement must be true in order for the alarm to be activated.
Your Answer
Correct Answer
True
The only place we turn on the alarm, digitalWrite(alarmPin, HIGH), is within the code of the if statement. The if statement will only execute its code when analogValue > tempthreshold.
Question 1 of 10
Conditional If Else Statements
In order for the alarm to be turned off, the analog input value would have to be less than...
Question 1 of 10
Conditional If Else Statements
Correct!
In order for the alarm to be turned off, the analog input value would have to be less than...
Correct Answer
201
The alarm is turned off in the else case's code. That code will execute when the if case does not, so it will execute when analogValue > tempthreshold is false. Since tempthreshold is 200, analogValue needs to be less than 201 to make the statement false.
Question 1 of 10
Conditional If Else Statements
Incorrect
In order for the alarm to be turned off, the analog input value would have to be less than...
Your Answer
Correct Answer
201
The alarm is turned off in the else case's code. That code will execute when the if case does not, so it will execute when analogValue > tempthreshold is false. Since tempthreshold is 200, analogValue needs to be less than 201 to make the statement false.
Question 1 of 10
Conditional If Else Statements
True or False: In this example, the curly brackets after the if and the else could have been eliminated.
Question 1 of 10
Conditional If Else Statements
Correct!
True or False: In this example, the curly brackets after the if and the else could have been eliminated.
Correct Answer
True
Since there is only one line of code after both the if and the else cases, we could have eliminated the curly braces and the program would have run the same.
Question 1 of 10
Conditional If Else Statements
Incorrect
True or False: In this example, the curly brackets after the if and the else could have been eliminated.
Your Answer
Correct Answer
True
Since there is only one line of code after both the if and the else cases, we could have eliminated the curly braces and the program would have run the same.
Question 1 of 10
Conditional If Else Statements
Question 1 of 10
Conditional If Else Statements
Correct!
True or False: In this program, analogValue is a constant.
Correct Answer
False
analogValue is declared as an int type, but not a const.
Question 1 of 10
Conditional If Else Statements
Incorrect
True or False: In this program, analogValue is a constant.
Your Answer
Correct Answer
False
analogValue is declared as an int type, but not a const.
Question 1 of 10
Conditional If Else Statements
True or False: If more than one line of code is to be executed when the if condition is true, curly brackets must be put around them.
Question 1 of 10
Conditional If Else Statements
Correct!
True or False: If more than one line of code is to be executed when the if condition is true, curly brackets must be put around them.
Correct Answer
True
If there are not curly brackets after the if statement, it will only execute (exactly) the next line of code when the condition is true. The program will then execute the line of code after that regardless of the condition's truth value.
Question 1 of 10
Conditional If Else Statements
Incorrect
True or False: If more than one line of code is to be executed when the if condition is true, curly brackets must be put around them.
Your Answer
Correct Answer
True
If there are not curly brackets after the if statement, it will only execute (exactly) the next line of code when the condition is true. The program will then execute the line of code after that regardless of the condition's truth value.
Question 1 of 10
Conditional If Else Statements
Question 1 of 10
Conditional If Else Statements
Correct!
True or False: Once the program is running, the value of tempthreshold can be changed.
Correct Answer
False
tempthreshold is a constant in this program, so its value cannot be changed.
Question 1 of 10
Conditional If Else Statements
Incorrect
True or False: Once the program is running, the value of tempthreshold can be changed.
Your Answer
Correct Answer
False
tempthreshold is a constant in this program, so its value cannot be changed.
Question 1 of 10
Conditional If Else Statements
True or False: If more than one line of code is to be executed when the else condition is true, curly brackets must be put around them.
Question 1 of 10
Conditional If Else Statements
Correct!
True or False: If more than one line of code is to be executed when the else condition is true, curly brackets must be put around them.
Correct Answer
True
Just like the if case, the else case also only executes (exactly) the next line of code by default. If you want it to execute more lines then that, you must use curly brackets.
Question 1 of 10
Conditional If Else Statements
Incorrect
True or False: If more than one line of code is to be executed when the else condition is true, curly brackets must be put around them.
Your Answer
Correct Answer
True
Just like the if case, the else case also only executes (exactly) the next line of code by default. If you want it to execute more lines then that, you must use curly brackets.
Question 1 of 10
Conditional If Else Statements
True or False: The code in both the if and the else portions can be executed in the same pass of the program run.
Question 1 of 10
Conditional If Else Statements
Correct!
True or False: The code in both the if and the else portions can be executed in the same pass of the program run.
Correct Answer
False
Only one of the if or else cases can be executed in one pass. If the if condition is true, the if code will be executed. Otherwise, the else code will be executed.
Question 1 of 10
Conditional If Else Statements
Incorrect
True or False: The code in both the if and the else portions can be executed in the same pass of the program run.
Your Answer
Correct Answer
False
Only one of the if or else cases can be executed in one pass. If the if condition is true, the if code will be executed. Otherwise, the else code will be executed.
Question 1 of 10
Conditional If Else Statements
What do the following lines of code do?
if (analogValue == tempthreshold)
digitalWrite(alarmPin, HIGH);
-
Assign the value of tempthreshold to analogValue and turn the alarm on.
-
Assign the value of tempthreshold to analogValue and leave the alarm in its current state.
-
Check if the value of analogValue is equal to tempthreshold and, if they are equal, turn the alarm on.
-
Check if the value of analogValue is equal to tempthreshold and, if they are equal, turn the alarm off.
Question 1 of 10
Conditional If Else Statements
Correct!
What do the following lines of code do?
if (analogValue == tempthreshold)
digitalWrite(alarmPin, HIGH);
Correct Answer
Check if the value of analogValue is equal to tempthreshold and, if they are equal, turn the alarm on.
The two equal signs check equality, so this statement sees if analogValue is equal to tempthreshold and, if so, turns the alarm on, digitalWrite(alarmPin, HIGH);.
Question 1 of 10
Conditional If Else Statements
Incorrect
What do the following lines of code do?
if (analogValue == tempthreshold)
digitalWrite(alarmPin, HIGH);
Your Answer
Correct Answer
Check if the value of analogValue is equal to tempthreshold and, if they are equal, turn the alarm on.
The two equal signs check equality, so this statement sees if analogValue is equal to tempthreshold and, if so, turns the alarm on, digitalWrite(alarmPin, HIGH);.
Question 1 of 10
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Conditional If Else Statements by Fox Valley Technical College is licensed under a Creative Commons Attribution 3.0 Unported License.