Podcast
Questions and Answers
What is the purpose of the break statement in a switch construct?
What is the purpose of the break statement in a switch construct?
- To exit the switch block. (correct)
- To repeat the current case.
- To default to the last case.
- To skip the next case.
Which data types can be used as case constants in a switch statement?
Which data types can be used as case constants in a switch statement?
- Only long and double types.
- Only boolean types.
- Numeric and character data types. (correct)
- Any reference type.
What happens if a switch variable does not match any case constants?
What happens if a switch variable does not match any case constants?
- The default case is executed if present. (correct)
- The program executes the statements after the switch block.
- The program terminates immediately.
- The program enters an infinite loop.
Where must the default case be positioned in a switch statement?
Where must the default case be positioned in a switch statement?
Which statement is true regarding the case constants in a switch statement?
Which statement is true regarding the case constants in a switch statement?
What will happen if you forget to assign a value to the switch variable before entering the switch construct?
What will happen if you forget to assign a value to the switch variable before entering the switch construct?
In the example given, if 'day' evaluates to '5', what will be the output?
In the example given, if 'day' evaluates to '5', what will be the output?
What keyword is used to start a switch statement?
What keyword is used to start a switch statement?
What will be the output when the variable 'day' is set to 5 in the switch statement?
What will be the output when the variable 'day' is set to 5 in the switch statement?
Which statement best describes the role of the loop control variable in a while loop?
Which statement best describes the role of the loop control variable in a while loop?
What is the correct syntax for a while loop?
What is the correct syntax for a while loop?
If the 'day' variable is set to 8, what will the switch statement output?
If the 'day' variable is set to 8, what will the switch statement output?
In the repetition statement definition, what is meant by the condition becoming false?
In the repetition statement definition, what is meant by the condition becoming false?
Which of the following keywords can be used to exit a while loop?
Which of the following keywords can be used to exit a while loop?
What is the primary purpose of using a switch statement?
What is the primary purpose of using a switch statement?
In the Fibonacci series example, where is the Fibonacci sequence generated?
In the Fibonacci series example, where is the Fibonacci sequence generated?
What is the main function of control statements in a program?
What is the main function of control statements in a program?
In the syntax of an if statement, what follows the 'if' keyword?
In the syntax of an if statement, what follows the 'if' keyword?
What does the else block do in an if-else statement?
What does the else block do in an if-else statement?
Which of the following is a correct example of an if-else statement?
Which of the following is a correct example of an if-else statement?
When would you typically use a switch statement instead of if-else statements?
When would you typically use a switch statement instead of if-else statements?
What would be the output of the following code snippet? int a=16; if (a%2==0) { System.out.println('This is an even number'); } else { System.out.println('It is an odd number'); }
What would be the output of the following code snippet? int a=16; if (a%2==0) { System.out.println('This is an even number'); } else { System.out.println('It is an odd number'); }
Which statement best describes the purpose of the boolean expression in an if statement?
Which statement best describes the purpose of the boolean expression in an if statement?
In the context of control structures, what does the term 'branching' refer to?
In the context of control structures, what does the term 'branching' refer to?
Flashcards
if statement
if statement
A decision-making statement that executes a block of code only if a condition is true.
if-else statement
if-else statement
A decision-making statement that executes one block of code if a condition is true and another block if it is false.
Boolean expression
Boolean expression
An expression that evaluates to either true or false.
switch statement
switch statement
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Selection statements
Selection statements
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Block of code
Block of code
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Control statements
Control statements
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Execution flow
Execution flow
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What is a loop?
What is a loop?
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while loop
while loop
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Loop Control Variable
Loop Control Variable
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break keyword
break keyword
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continue keyword
continue keyword
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Fibonacci Series
Fibonacci Series
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What is the purpose of the switch
statement?
What is the purpose of the switch
statement?
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What is the default case?
What is the default case?
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Case Constant
Case Constant
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Default Keyword
Default Keyword
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What data types can be used in a switch statement?
What data types can be used in a switch statement?
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What happens if there are multiple matching cases?
What happens if there are multiple matching cases?
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When should the 'default' label be used?
When should the 'default' label be used?
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Can case labels have duplicate values?
Can case labels have duplicate values?
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Study Notes
Control Structures
- Programs use control statements to manage the order of instruction execution
- Control flow depends on data values and conditional logic
- Java supports Selection, Repetition, and Branching
Selection (Agarwal & Bansal, 2023)
- Selection statements are decision-making tools including
if
,if-else
, andswitch
if
statement:- Evaluates a logical expression
- Executes statements if the expression is true
- Syntax:
if (boolean-expression) { statements; }
- Example:
int a = 16; if (a % 2 == 0) { System.out.println("Even number"); }
if-else
statement:- Provides an alternative action if the
if
condition is false - Executes the
else
block when theif
condition is false - Syntax:
if (boolean-expression) { statements; } else { statements; }
- Example:
if (aNum1 > aNum2) { aMax = aNum1; } else { aMax = aNum2; }
- Provides an alternative action if the
switch
statement:- Easier for multiple possible values
- Compares a variable against a list of constants
case
constants must match the variable typebreak
exits the switch constructdefault
handles unmatched cases- Syntax:
switch (variable-name) { case exprsn1: statements; break; case exprsn2: statements; break; default: statement; }
Repetition (Agarwal & Bansal, 2023)
- Loops repeatedly execute a block of code
while
loop:- Executes a block as long as a condition is true
- Syntax:
while (boolean-expression) { statement; }
- Example:
int i1 = 1, i2 = 1; System.out.println(i1); while (i1 <= i2) { i2 += i1; i1 = i2 - i1; System.out.println(i1); }
do-while
loop:- Executes a block at least once, then repeats while a condition is true
- Syntax:
do { statement; } while (expression);
- Example:
int j = 1; do { System.out.println(j); j++; } while (j <= 10);
for
loop:- Useful for loops with a predetermined number of iterations
- Syntax:
for (initialization; test-expression; increment/decrement) { statement; }
- Example:
int invar; for (invar = 1; invar <= 10; invar++) { System.out.print(invar*invar); }
Branching (Agarwal & Bansal, 2023)
- Statements that alter program flow
break
statement:- Exits the innermost loop or switch statement
break label;
exists an outer loop- Example:
for (int i = 1; i <= range; i++) { if (i == 5) break; System.out.println(i); }
continue
statement:- Skips the rest of the current loop iteration
- Resumes with the next iteration
- Example:
int i = 1; while (i <= 10) { i++; if (i == 5) continue; System.out.println("i="+i); }
return
statements:- Ends a method's execution
- Returns a value to the calling method
- Example:
public static int square(int a) { return (a * a); }
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Description
Test your knowledge on control structures in Java, focusing on selection statements like if
, if-else
, and switch
. This quiz will help reinforce your understanding of how these control mechanisms dictate the flow of a program's execution.