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Questions and Answers
What day will be printed when the variable 'day' holds the value 5?
What day will be printed when the variable 'day' holds the value 5?
What happens if 'day' is set to 8 in the switch statement?
What happens if 'day' is set to 8 in the switch statement?
Which looping statement continues until a specified condition becomes false?
Which looping statement continues until a specified condition becomes false?
What is the role of the loop control variable in a while loop?
What is the role of the loop control variable in a while loop?
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What is the output of the 'FibonacciDemo' class's while loop if it starts with 'i1' and 'i2' both set to 1?
What is the output of the 'FibonacciDemo' class's while loop if it starts with 'i1' and 'i2' both set to 1?
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What is the correct syntax for a while loop in Java?
What is the correct syntax for a while loop in Java?
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What must be true about the case constant in a switch statement?
What must be true about the case constant in a switch statement?
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Which keyword is utilized to exit a loop immediately when a condition is met?
Which keyword is utilized to exit a loop immediately when a condition is met?
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What happens if the break statement is omitted in a case of a switch statement?
What happens if the break statement is omitted in a case of a switch statement?
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In the context of a switch statement, what is the purpose of the 'break' statement?
In the context of a switch statement, what is the purpose of the 'break' statement?
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Where must the default label be placed within the switch construct?
Where must the default label be placed within the switch construct?
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Which of the following data types can be used as case expressions in a switch statement?
Which of the following data types can be used as case expressions in a switch statement?
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What is a primary reason for using the switch statement over multiple if-else statements?
What is a primary reason for using the switch statement over multiple if-else statements?
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What is the purpose of the switch keyword in the syntax of a switch statement?
What is the purpose of the switch keyword in the syntax of a switch statement?
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What should be done before entering a switch statement?
What should be done before entering a switch statement?
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What will happen if there are duplicate case constants in a switch statement?
What will happen if there are duplicate case constants in a switch statement?
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What is the primary purpose of control structures in programming?
What is the primary purpose of control structures in programming?
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Which of the following statements is an example of an if-else structure?
Which of the following statements is an example of an if-else structure?
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In an if statement, which part follows the logical expression?
In an if statement, which part follows the logical expression?
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What does the else block specifically do in an if-else statement?
What does the else block specifically do in an if-else statement?
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Which statement is true about the switch statement?
Which statement is true about the switch statement?
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Which of the following best describes the syntax of an if statement?
Which of the following best describes the syntax of an if statement?
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How does the if statement determine which block of code to execute?
How does the if statement determine which block of code to execute?
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In the following code snippet, what will be printed if a is 15? if (a % 2 == 0) { System.out.println('This is an even number'); } else { System.out.println('It is an odd number'); }
In the following code snippet, what will be printed if a is 15? if (a % 2 == 0) { System.out.println('This is an even number'); } else { System.out.println('It is an odd number'); }
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Study Notes
Control Structures
- Programs use control structures to determine the order instructions are executed.
- Control statements (selection, repetition, branching) manage program flow.
- Java supports selection, repetition, and branching.
Selection (Agarwal & Bansal, 2023)
- Selection statements control program flow based on comparison results.
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ifstatement: Evaluates a boolean expression; executes a block of statements if true.- Syntax:
if (boolean-expression) { statements; } - Example:
int a=16; if (a%2==0) { System.out.println("Even"); }
- Syntax:
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if-elsestatement: Executes one block if the condition is true and another if false.- Syntax:
if (boolean-expression) { statements; } else { statements; } - Example:
if (aNum1 > aNum2) { aMax = aNum1; } else { aMax = aNum2; }
- Syntax:
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switchstatement: Selects code based on a variable's value.- Syntax:
switch (variable-name) { case exprsn1: statements; break; case exprsn2 : statement; break; default: statement; } - It works with byte, short, char, or int types only.
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breakexits the switch. -
defaulthandles unmatched cases.
- Syntax:
Repetition (Agarwal & Bansal, 2023)
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Repetition statements loop based on conditions.
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whileloop: Executes as long as condition is true.- Syntax:
while (boolean-expression) { statement; }
- Syntax:
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do-whileloop: Executes at least once, then repeats while condition is true.- Syntax:
do { statement;} while(expression);
- Syntax:
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forloop: Executes a set number of times (has initializer, condition, increment).- Syntax:
for (initialization; test; increment) { statement; }
- Syntax:
Branching (Agarwal & Bansal, 2023)
- Branching statements alter program execution flow.
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break: Exits a loop or switch statement.-
break;,break label;orbreakswitch
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continue: Skips the current iteration of a loop. -
return: Exits a method and returns a value (or nothing if void).-
return values;, orreturn;orreturn expression;
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Description
This quiz covers control structures in Java, focusing on selection statements such as 'if', 'if-else', and 'switch'. You'll explore how these statements manage the flow of a program based on condition evaluations. Test your understanding of how to apply these concepts effectively in your Java programming.
