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Questions and Answers
What is the main purpose of the 'is_even' function in the provided solution?
What will be the output if the user enters 3 and 5?
Which statement accurately describes the output when both integers are even?
How does using functions, like 'is_even', benefit the provided programming solution?
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What variable indicates whether the first integer is even in the original solution?
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What is the purpose of using the 'static' keyword in a method declaration?
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When defining a method, what must be true about the returned value?
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What is a key characteristic of a palindrome?
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Which of the following statements about method parameters is correct?
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What will happen if you try to call the isEven method without defining it first?
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Study Notes
Why use methods?
- Can simplify code and make it easier to read.
- Encourages reuse of code and reduces repetition.
- Makes code more modular and easier to change.
Methods in Java
- A method is a block of code that performs a specific task.
- Defined using the following template:
public static returnType name(dataType parameter) {
// body of method
}
- Can have a return type, which dictates the data type of the value returned from the method.
- The
voidkeyword is used when a method does not return a value.
Components of a method
- public: keyword indicating the method can be accessed from anywhere.
- static: keyword indicating the method is associated with the class, not an instance of the class.
- returnType: specifies the data type of the value returned by the method.
- name: the name of the method (use camelCase for naming).
- parameter(s): variables that are passed to the method when it is called.
How to call a method
- Methods can only be called after they have been defined within the class.
- The order of parameters in the method definition must match the arguments when calling the method.
- One method can call another if the called method is within the valid scope.
Example: isEven() method
- Takes an integer parameter
num. - Determines if the argument
numis even or odd. - Prints a result based on the parity of the input.
- Returns
trueif the number is even,falseotherwise. - Example:
public static Boolean isEven(int num) {
if (num % 2 == 0) {
System.out.println(num + " is even.");
return true;
} else {
System.out.println(num + " is odd.");
return false;
}
}
Palindrome problem
- A palindrome is a word that reads the same forwards and backwards.
- Implement a Java method that:
- Takes a word as input.
- Determines if the word is a palindrome.
- Return
trueif it is a palindrome,falseif not.
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Description
This quiz covers the basics of methods in Java, including their definition, components, and how to call them. Understanding methods is crucial for writing efficient and modular code in Java programming. Test your knowledge on using methods effectively.
