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Questions and Answers
What is the primary purpose of using flow control in a program?
What is the primary purpose of using flow control in a program?
- To reduce the overall complexity of the program.
- To allow the program to run top to bottom without interruption.
- To change the execution path of the program based on conditions. (correct)
- To enhance the program's ability to accept multiple inputs.
In the context of the provided age-checking program, what happens if the user's age is less than 18?
In the context of the provided age-checking program, what happens if the user's age is less than 18?
- The program continues to run and displays all available options.
- The program outputs a message and terminates. (correct)
- The program ignores the age input and runs normally.
- The program asks the user to re-enter their age.
What Boolean operator is used to check if two values are different?
What Boolean operator is used to check if two values are different?
- >
- ==
- <
- != (correct)
Which statement correctly uses a boolean expression to check if the value of x is greater than 4?
Which statement correctly uses a boolean expression to check if the value of x is greater than 4?
What is the output of the statement 'System.out.println("x == 3 is " + (x == 3));' if x is initialized as 4?
What is the output of the statement 'System.out.println("x == 3 is " + (x == 3));' if x is initialized as 4?
Which of the following expressions will return true if x is 5?
Which of the following expressions will return true if x is 5?
What is the result of '!(x == 4)' when x is 4?
What is the result of '!(x == 4)' when x is 4?
When using boolean logic, what will the expression 'x < 3' evaluate to when x is 4?
When using boolean logic, what will the expression 'x < 3' evaluate to when x is 4?
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Study Notes
Program Flow
- Programs can change their execution flow based on conditions.
- This creates different paths for the program to follow.
Boolean Logic
- George Boole introduced Boolean algebra with truth values of "true" and "false".
- These values are represented by 1 and 0.
- In programming, "true" and "false" are used to evaluate statements.
- For example, the statement "x == 5" is "true" if x is equal to 5, and "false" if x is not equal to 5.
Boolean Operators
- Operators are used to test the values of variables.
- Operators are used to evaluate boolean expressions.
- Examples of Boolean operators:
- Equal (==): x == 5 (true if x is equal to 5)
- Not Equal (!=): x != 5 (true if x is not equal to 5)
- Less than (<): x < 3 (true if x is less than 3)
- Greater than (>): x > 4 (true if x is greater than 4)
- Less than or equal to (<=): x <= 6 (true if x is less than or equal to 6)
- Greater than or equal to (>=): x >= 6 (true if x is greater than or equal to 6)
- Negation (!): !!(x == 4) (true if x is not equal to 4)
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