What this deck covers
This deck focuses on Assignment Statements And Input, giving you a quick way to review the definitions, rules, and examples that matter most for AP Computer Science a.
AP Computer Science a Flashcards: Assignment Statements And Input
Study Assignment Statements And Input in AP Computer Science a with focused flashcards that help you recognize the idea, recall the key rule, and apply it in practice-style prompts.
AP Computer Science a
Assignment Statements And Input
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QUESTION
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Identify the error in 'boolean flag = "true";'
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ANSWER
Should be: boolean flag = true;. Boolean variables require boolean literals, not strings.
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Flashcard 1: Identify the error in 'boolean flag = "true";'
Answer: Should be: boolean flag = true;. Boolean variables require boolean literals, not strings.
Flashcard 2: Convert the string "123" to an integer.
Answer: Integer.parseInt("123");. Converts String representation to int value.
Flashcard 3: What is the output of 'System.out.println(3 * 2 + " apples");'?
Answer: 6 apples. Arithmetic is evaluated first, then concatenated with string.
Flashcard 4: Identify the error: 'int a; a = "hello";'
Answer: Cannot assign String to int. String literal cannot be stored in int variable.
Flashcard 5: What is the output of 'System.out.println("5" + 5);'?
Answer:
Flashcard 6: Which data type is used for true/false values?
Answer: The boolean data type. Stores either true or false values in Java.
Flashcard 7: What does 'int a = 7;' do?
Answer: Declares and initializes 'a' with 7. Creates variable and assigns initial value in one statement.
Flashcard 8: What is the initial value of an int array element?
Answer:
Flashcard 9: Find and correct the error: 'int num = "10";'
Answer: Correct: int num = 10;. Cannot assign String literal to int variable.
Flashcard 10: What is the result of 'Math.pow(2, 3)'?
Answer: 8.0. Calculates 23 which equals 8.0.
Flashcard 11: What method reads an integer from Scanner 'sc'?
Answer: sc.nextInt();. Reads next integer token from input stream.
Flashcard 12: What keyword declares a constant in Java?
Answer: The 'final' keyword. Prevents variable value from being changed after initialization.
Flashcard 13: What is the syntax for declaring an integer variable 'a'?
Answer: int a;. Declares variable without assigning a value.
Flashcard 14: What is an assignment statement in Java?
Answer: An assignment statement assigns a value to a variable. It stores a value in memory using the = operator.
Flashcard 15: What is the result of '10 / 3' in integer division?
Answer: The result is 3. Integer division truncates the decimal portion.
Flashcard 16: Convert the string "123" to an integer.
Answer: Integer.parseInt("123");. Converts String representation to int value.
Flashcard 17: What is the result of '5.0 / 2' in Java?
Answer: 2.5. At least one operand is double, so result is double.
Flashcard 18: Which data type is used for true/false values?
Answer: The boolean data type. Stores either true or false values in Java.
Flashcard 19: How do you import the Scanner class in Java?
Answer: import java.util.Scanner;. Required before using Scanner in your program.
Flashcard 20: What is the purpose of 'System.in'?
Answer: It is used for input from the keyboard. Standard input stream for reading user data.
Flashcard 21: What is the default value of a boolean variable?
Answer: false. Boolean variables automatically initialize to false.
Flashcard 22: What keyword declares a constant in Java?
Answer: The 'final' keyword. Prevents variable value from being changed after initialization.
Flashcard 23: What is the output of 'System.out.println(5 == 5);'?
Answer: true. The equality comparison evaluates to boolean true.
Flashcard 24: What is the result of '5.0 / 2' in Java?
Answer: 2.5. At least one operand is double, so result is double.
Flashcard 25: What is the result of '10 / 3' in integer division?
Answer: The result is 3. Integer division truncates the decimal portion.
Flashcard 26: What is the syntax to declare a char 'c'?
Answer: char c;. Declares single character variable.
Flashcard 27: What operator is used for assignment in Java?
Answer: The equal sign '=' is used for assignment. Not to be confused with == which tests equality.
Flashcard 28: Identify the error: 'int a; a = "hello";'
Answer: Cannot assign String to int. String literal cannot be stored in int variable.
Flashcard 29: What method reads a line of text in Scanner 'sc'?
Answer: sc.nextLine();. Reads entire line including spaces until newline.
Flashcard 30: What is the result of 'Math.pow(2, 3)'?
Answer: 8.0. Calculates 23 which equals 8.0.
Flashcard 31: Which operator checks equality in Java?
Answer: The '==' operator. Compares values for equality, returns boolean.
Flashcard 32: What method reads a line of text in Scanner 'sc'?
Answer: sc.nextLine();. Reads entire line including spaces until newline.
Flashcard 33: What is the output of 'System.out.println(2 + "3");'?
Answer:
Flashcard 34: Which method is used to read a double from Scanner 'sc'?
Answer: sc.nextDouble();. Reads floating-point number from input stream.
Flashcard 35: What is the purpose of 'System.in'?
Answer: It is used for input from the keyboard. Standard input stream for reading user data.
Flashcard 36: What operator is used for assignment in Java?
Answer: The equal sign '=' is used for assignment. Not to be confused with == which tests equality.
Flashcard 37: What is the syntax to declare a float 'f'?
Answer: float f;. Declares floating-point variable without initialization.
Flashcard 38: What is the output of 'System.out.println(5 == 5);'?
Answer: true. The equality comparison evaluates to boolean true.
Flashcard 39: What is the output of 'System.out.println(5 / 2);'?
Answer:
Flashcard 40: What is the default value of a boolean variable?
Answer: false. Boolean variables automatically initialize to false.
Flashcard 41: What does 'int a = 7;' do?
Answer: Declares and initializes 'a' with 7. Creates variable and assigns initial value in one statement.
Flashcard 42: Identify the error in 'Scanner sc = new Scanner(System.in'
Answer: Missing closing parenthesis ')'. Constructor call needs both opening and closing parentheses.
Flashcard 43: How to declare a double variable 'd'?
Answer: double d;. Declares double-precision floating-point variable.
Flashcard 44: What symbol is used for comments in Java?
Answer: // for single line comments. Text after these symbols is ignored by compiler.
Flashcard 45: What is the output of 'System.out.println(3.0 * 2);'?
Answer: 6.0. Double operand makes result a double value.
Flashcard 46: Which operator checks equality in Java?
Answer: The '==' operator. Compares values for equality, returns boolean.
Flashcard 47: What is an assignment statement in Java?
Answer: An assignment statement assigns a value to a variable. It stores a value in memory using the = operator.
Flashcard 48: What is the output of 'System.out.println(2 + "3");'?
Answer:
Flashcard 49: What symbol is used for comments in Java?
Answer: // for single line comments. Text after these symbols is ignored by compiler.
Flashcard 50: What is the syntax to declare a float 'f'?
Answer: float f;. Declares floating-point variable without initialization.
Flashcard 51: What is the syntax for initializing a String 's'?
Answer: String s = "Hello";. String literals are enclosed in double quotes.
Flashcard 52: What method reads an integer from Scanner 'sc'?
Answer: sc.nextInt();. Reads next integer token from input stream.
Flashcard 53: What is the initial value of an int array element?
Answer:
Flashcard 54: What is the output of 'System.out.println(3 * 2 + " apples");'?
Answer: 6 apples. Arithmetic is evaluated first, then concatenated with string.
Flashcard 55: Find and correct the error: 'int num = "10";'
Answer: Correct: int num = 10;. Cannot assign String literal to int variable.
Flashcard 56: How do you import the Scanner class in Java?
Answer: import java.util.Scanner;. Required before using Scanner in your program.
Flashcard 57: What is the syntax for initializing a String 's'?
Answer: String s = "Hello";. String literals are enclosed in double quotes.
Flashcard 58: What is the syntax for declaring an integer variable 'a'?
Answer: int a;. Declares variable without assigning a value.
Flashcard 59: What is the result of '7 % 3' in Java?
Answer:
Flashcard 60: What is the output of 'System.out.println(3.0 * 2);'?
Answer: 6.0. Double operand makes result a double value.
Flashcard 61: What is the result of '7 % 3' in Java?
Answer:
Flashcard 62: What is the output of 'System.out.println("5" + 5);'?
Answer:
Flashcard 63: Which method is used to read a double from Scanner 'sc'?
Answer: sc.nextDouble();. Reads floating-point number from input stream.
Flashcard 64: Identify the error in 'Scanner sc = new Scanner(System.in'
Answer: Missing closing parenthesis ')'. Constructor call needs both opening and closing parentheses.
Flashcard 65: Identify the error in 'boolean flag = "true";'
Answer: Should be: boolean flag = true;. Boolean variables require boolean literals, not strings.
Flashcard 66: What is the syntax to declare a char 'c'?
Answer: char c;. Declares single character variable.
Flashcard 67: What is the output of 'System.out.println(5 / 2);'?
Answer:
Flashcard 68: How to declare a double variable 'd'?
Answer: double d;. Declares double-precision floating-point variable.