All Flashcards
How are boolean expressions and conditional statements used in validating user input?
They are used to check if the input meets certain criteria (e.g., is within a valid range, is of the correct format) before processing it.
How are conditional statements used in game development?
To control game logic, such as character movement, collision detection, and scoring.
How are boolean expressions and conditional statements used in decision-making systems?
They are used to evaluate different options and select the best course of action based on predefined rules.
How are conditional statements used in controlling access to resources?
They are used to check user permissions and grant or deny access based on their roles and privileges.
How are boolean expressions used in search algorithms?
To filter results based on specific criteria, such as keywords, date ranges, or file types.
How are conditional statements used in automated systems?
To make decisions based on sensor data or other inputs, such as adjusting temperature, activating alarms, or controlling machinery.
How are boolean expressions used in data analysis?
To filter and categorize data based on specific conditions, such as identifying outliers or grouping similar data points.
How are conditional statements used in web applications?
To handle different user interactions, display different content based on user roles, and control navigation.
How are boolean expressions used in AI and machine learning?
To create decision trees and other models that classify data based on specific features.
How are conditional statements used in financial modeling?
To simulate different scenarios and predict outcomes based on various economic conditions.
What are the differences between == and .equals() in Java?
==: compares object references (memory addresses) | .equals(): compares the content of the objects.
What are the differences between && and ||?
&& (AND): Returns true only if both operands are true | || (OR): Returns true if at least one operand is true.
What are the differences between an if statement and an if-else statement?
if: Executes code only if the condition is true | if-else: Executes one block if true, another if false.
What are the differences between simple and compound boolean expressions?
Simple: single comparison | Compound: multiple comparisons combined with logical operators.
What are the differences between using nested if statements and compound boolean expressions?
Nested if statements can be more readable for complex logic, but compound boolean expressions can be more concise.
What are the differences between using multiple if statements vs. a single if-else if-else statement?
Multiple if statements will all be evaluated independently. An if-else if-else statement will stop evaluating after the first true condition.
What are the differences between a conditional statement and an iterative statement?
Conditional: Executes code based on a condition (if/else) | Iterative: Repeats code execution (for/while).
What are the differences between a boolean variable and a boolean expression?
Boolean variable: stores a boolean value (true/false) | Boolean expression: evaluates to a boolean value.
What are the differences between using ! and not using it?
! negates a boolean value. Using it can sometimes simplify code, while other times it can make it more confusing.
What are the differences between x > 0 || x < 10 and x > 0 && x < 10?
x > 0 || x < 10: true if x is greater than 0 OR less than 10 | x > 0 && x < 10: true if x is greater than 0 AND less than 10.
What does the following code output?
java
int x = 5;
if (x > 3) {
System.out.println("A");
} else {
System.out.println("B");
}
A
What does the following code output?
java
int x = 10;
if (x < 5 && x > 7) {
System.out.println("True");
} else {
System.out.println("False");
}
False
What does the following code output?
java
String str1 = "hello";
String str2 = new String("hello");
if (str1.equals(str2)) {
System.out.println("Equal");
} else {
System.out.println("Not Equal");
}
Equal
What does the following code output?
java
boolean a = true;
boolean b = false;
System.out.println(!a || b);
false
Identify the error in the following code:
java
if (x = 5) {
System.out.println("x is 5");
}
The condition should use == for comparison, not = for assignment. It should be if (x == 5).
What does the following code output?
java
int score = 75;
if (score >= 90) {
System.out.println("A");
} else if (score >= 80) {
System.out.println("B");
} else if (score >= 70) {
System.out.println("C");
} else {
System.out.println("D");
}
C
What does the following code output?
java
int num = 6;
if (num % 2 == 0 && num % 3 == 0) {
System.out.println("Divisible by 2 and 3");
} else {
System.out.println("Not divisible by 2 and 3");
}
Divisible by 2 and 3
What does the following code output?
java
int age = 20;
String message = (age >= 18) ? "Adult" : "Minor";
System.out.println(message);
Adult
What does the following code output?
java
String s1 = new String("Java");
String s2 = new String("Java");
System.out.println(s1 == s2);
false
What does the following code output?
java
boolean x = false, y = true;
if (x = y) {
System.out.println("True");
} else {
System.out.println("False");
}
True