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Questions and Answers
What are the three main control structures in any programming language?
What are the three main control structures in any programming language?
- If, If/Else, Else/If
- Sequence, Selection, Iteration (correct)
- If, Else, Switch
- For, While, Do/While
Which control structure is used to choose between alternative courses of action in a Java program?
Which control structure is used to choose between alternative courses of action in a Java program?
- while
- if (correct)
- do/while
- for
In a selection structure, what follows the keyword 'if'?
In a selection structure, what follows the keyword 'if'?
- An expression in parentheses (correct)
- A variable declaration
- A loop condition
- A sequence of statements
What is the purpose of the 'else' statement in the 'if/else' selection structure?
What is the purpose of the 'else' statement in the 'if/else' selection structure?
Which control structure is used for executing instructions repeatedly until a logical condition is satisfied?
Which control structure is used for executing instructions repeatedly until a logical condition is satisfied?
In a Java program, what determines the price of a cinema ticket based on the user's age?
In a Java program, what determines the price of a cinema ticket based on the user's age?
What is the syntax of the if statement in Java?
What is the syntax of the if statement in Java?
Which operator is used to check if a value is greater than or equal to another value in Java?
Which operator is used to check if a value is greater than or equal to another value in Java?
What does the following code do in Java? if(length == width) { System.out.print("it is square"); }
What does the following code do in Java? if(length == width) { System.out.print("it is square"); }
What would be the output of the following code in Java? if(hrsWked > 38) { System.out.print("Overtime hours: " +(hrsWked - 38)); }
What would be the output of the following code in Java? if(hrsWked > 38) { System.out.print("Overtime hours: " +(hrsWked - 38)); }
What is the purpose of indentation in the if statement?
What is the purpose of indentation in the if statement?
What happens if the expression in an if statement is false?
What happens if the expression in an if statement is false?
What does the following code do in Java? if(totalPrice >= 100) { disc = totalPrice *.1; totalPrice = totalPrice - disc; }
What does the following code do in Java? if(totalPrice >= 100) { disc = totalPrice *.1; totalPrice = totalPrice - disc; }
What type of comparison does the operator '==' represent in Java?
What type of comparison does the operator '==' represent in Java?
What would be the output of the following code in Java? if(balance > 0) { fee = 0; }
What would be the output of the following code in Java? if(balance > 0) { fee = 0; }
What does the operator '>=' represent in Java?
What does the operator '>=' represent in Java?
Study Notes
Control Structures in Java
- The three main control structures in any programming language are selection, repetition, and sequence.
Selection Structures
- Selection structures are used to choose between alternative courses of action in a Java program.
- The keyword 'if' is used in selection structures, followed by a boolean expression.
- The 'else' statement is used in the 'if/else' selection structure to specify an alternative course of action when the condition is false.
If Statement in Java
- The syntax of the if statement in Java is
if (boolean expression) { statements }
. - The
>=
operator is used to check if a value is greater than or equal to another value in Java. - The
==
operator represents equality comparison in Java, checking if two values are equal.
If Statement Examples
if (length == width) { System.out.print("it is square"); }
: This code checks if the length is equal to the width, and prints "it is square" if true.if (hrsWked > 38) { System.out.print("Overtime hours: " + (hrsWked - 38)); }
: This code checks if the hours worked is greater than 38, and prints the overtime hours if true.if (totalPrice >= 100) { disc = totalPrice *.1; totalPrice = totalPrice - disc; }
: This code checks if the total price is greater than or equal to 100, and applies a 10% discount if true.if (balance > 0) { fee = 0; }
: This code checks if the balance is greater than 0, and sets the fee to 0 if true.
If Statement Rules
- Indentation is used to denote the block of code within the if statement.
- If the expression in an if statement is false, the code within the if block is skipped.
- The
>=
operator represents "greater than or equal to" in Java.
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Description
Test your knowledge of Java control structures with this quiz. Learn about sequence, selection, and repetition/iteration in Java programming, including if, if/else, switch, for, while, and do/while statements.