All Flashcards
How are while loops used in input validation?
To repeatedly prompt the user for input until a valid input is provided.
How are while loops used in game development?
To maintain the game loop, continuously updating the game state and rendering the graphics.
How are while loops used in data processing?
To iterate through large datasets, performing operations on each element until the end of the data is reached.
How can while loops be used to simulate real-world processes?
By modeling repetitive tasks or events that continue until a specific condition is met, such as a machine running until it runs out of material.
How are while loops used in file processing?
To read and process data from a file line by line until the end of the file is reached.
How is exception handling used in real-world banking systems?
To handle situations like insufficient funds, invalid account numbers, or network errors during transactions, ensuring data integrity and system stability.
How are while loops used in operating systems?
To continuously monitor system resources and respond to events, such as handling user input or managing processes.
What are the steps to determine if a number is divisible by another number without using the modulo operator?
- Check for invalid input (negative number or non-positive divisor). 2. If the number is 0, return true. 3. While the number is greater than 0, subtract the divisor from the number. 4. Return true if the number is 0 after the loop, false otherwise.
What are the steps to extract digits from an integer?
- Check for invalid input (negative number). 2. While the number is not 0, print the last digit (number % 10). 3. Remove the last digit (number /= 10).
What are the steps to find the minimum value from a series of user inputs using a while loop?
- Initialize min with the first input number. 2. While the input is not the sentinel value, compare the input with min. 3. If the input is less than min, update min. 4. Get the next input.
What are the steps to find the maximum value from a series of user inputs using a while loop?
- Initialize max with the first input number. 2. While the input is not the sentinel value, compare the input with max. 3. If the input is greater than max, update max. 4. Get the next input.
What are the steps to compute the sum of a series of user inputs using a while loop?
- Initialize sum to 0. 2. While the input is not the sentinel value, add the input to sum. 3. Get the next input.
What are the steps to compute the average of a series of user inputs using a while loop?
- Initialize sum to 0 and counter to 0. 2. While the input is not the sentinel value, add the input to sum and increment counter. 3. Get the next input. 4. Calculate the average (sum / counter).
What does the following code output?
java
int i = 0;
while (i < 5) {
System.out.println(i);
i++;
}
0 1 2 3 4
Identify the error in the following code:
java
int i = 0;
while (i < 5) {
System.out.println(i);
}
The loop will run infinitely because the value of i is never updated.
What does the following code output?
java
int i = 5;
while (i > 0) {
System.out.println(i);
i--;
}
5 4 3 2 1
Identify the error in the following code:
java
int i = 10;
while (i > 0);
{
System.out.println(i);
i--;
}
The semicolon after the while condition creates an empty loop, and the subsequent block is executed only once.
What does the following code output?
java
int i = 0;
while (i < 10) {
if (i % 2 == 0) {
System.out.println(i + " is even");
}
i++;
}
0 is even 2 is even 4 is even 6 is even 8 is even
Identify the error in the following code:
java
int i = 0;
while (i < 5) {
System.out.println(i);
i++;
if (i == 3) {
break;
}
}
No error. This code will print 0, 1, and 2, then exit the loop.
What does the following code output?
java
int i = 0;
while (i < 5) {
i++;
if (i == 3) {
continue;
}
System.out.println(i);
}
1 2 4 5
Identify the error in the following code:
java
int number = -5;
while (number > 0) {
System.out.println(number);
number--;
}
The loop condition is initially false, so the loop body will never execute.
What does the following code output?
java
int i = 0;
while (true) {
System.out.println(i);
i++;
if (i > 5) {
break;
}
}
0 1 2 3 4 5
Identify the error in the following code:
java
int i = 0;
while (i < 5) {
System.out.println(i++);
}
No error. This code will print 0, 1, 2, 3, and 4.
What does the following code output?
java
int x = 10;
try {
int result = x / 0;
System.out.println("Result: " + result);
} catch (ArithmeticException e) {
System.out.println("Error: Division by zero");
}
Error: Division by zero