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This deck focuses on Algorithms With Selection And Repetition, 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: Algorithms With Selection And Repetition
Study Algorithms With Selection And Repetition 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
Algorithms With Selection And Repetition
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What is the syntax for a switch statement in Java?
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ANSWER
switch(expression) { case value: statements; break; }. Multi-way selection based on expression value.
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Flashcard 1: What is the syntax for a switch statement in Java?
Answer: switch(expression) { case value: statements; break; }. Multi-way selection based on expression value.
Flashcard 2: What keyword is used to define multiple selections in a switch statement?
Answer: case. Each case represents a possible match value.
Flashcard 3: What is an iteration in the context of loops?
Answer: A single execution of the loop body. One complete pass through the loop body.
Flashcard 4: What differentiates a for loop from a while loop?
Answer: Initialization, condition, and update in one line. For loop combines all control elements in header.
Flashcard 5: What is the syntax for a do-while loop in Java?
Answer: do { statements } while (condition);. Body executes first, then condition is checked.
Flashcard 6: Which loop structure is best for iterating a known number of times?
Answer: for loop. Compact syntax when iteration count is predetermined.
Flashcard 7: What keyword is used to exit a loop prematurely?
Answer: break. Immediately terminates loop execution.
Flashcard 8: What is the syntax for a basic if statement in Java?
Answer: if (condition) { statements }. Standard conditional statement structure in Java.
Flashcard 9: What is the syntax for a basic if statement in Java?
Answer: if (condition) { statements }. Standard conditional statement structure in Java.
Flashcard 10: Identify the operator used to compare equality in Java.
Answer: ==. Double equals compares values, single equals assigns.
Flashcard 11: What is the default case in a switch statement?
Answer: Executed if no case matches. Catches all unmatched values in switch statement.
Flashcard 12: Determine the output: int i = 0; do { System.out.print(i); } while (i > 0);
Answer:
Flashcard 13: What is the purpose of a loop control variable?
Answer: To control the number of iterations of the loop. Manages how many times the loop body executes.
Flashcard 14: Which loop structure is best for iterating a known number of times?
Answer: for loop. Compact syntax when iteration count is predetermined.
Flashcard 15: How many times will this loop execute? for (int i = 0; i < 5; i++)
Answer: 5 times. Loop runs while i < 5: values 0, 1, 2, 3, 4.
Flashcard 16: What is the significance of the loop condition?
Answer: Determines when the loop stops. Controls whether loop continues or terminates.
Flashcard 17: What is the purpose of a loop control variable?
Answer: To control the number of iterations of the loop. Manages how many times the loop body executes.
Flashcard 18: Find the error: for (int i = 0; i < 10; i--)
Answer: i-- should be i++. Decrement creates infinite loop since i never reaches 10.
Flashcard 19: Identify the keyword used for creating a loop in Java.
Answer: for, while, or do-while. These are the three main loop keywords in Java.
Flashcard 20: Identify the operator used to compare equality in Java.
Answer: ==. Double equals compares values, single equals assigns.
Flashcard 21: What is an infinite loop?
Answer: A loop that never terminates. Occurs when loop condition never becomes false.
Flashcard 22: What is the result of the expression: 4 >= 4?
Answer: true. Greater than or equal to includes equality.
Flashcard 23: Which loop condition form ensures a loop runs zero or more times?
Answer: while loop. Condition checked before execution, may not run at all.
Flashcard 24: What is the syntax for a switch statement in Java?
Answer: switch(expression) { case value: statements; break; }. Multi-way selection based on expression value.
Flashcard 25: Determine the output: int x = 0; while (x < 2) { x++; } System.out.print(x);
Answer:
Flashcard 26: Which loop always executes its block at least once?
Answer: do-while loop. Condition is checked after execution, guaranteeing one run.
Flashcard 27: What differentiates a for loop from a while loop?
Answer: Initialization, condition, and update in one line. For loop combines all control elements in header.
Flashcard 28: What is an infinite loop?
Answer: A loop that never terminates. Occurs when loop condition never becomes false.
Flashcard 29: Identify the error: for (int i = 0; i < 5; i++) { System.out.print(i); }
Answer: No error. Syntax is correct for standard for loop.
Flashcard 30: What is the result of: boolean b = (2 < 3) && (3 > 2);
Answer: true. Both conditions are true, AND returns true.
Flashcard 31: How is a for loop typically structured in Java?
Answer: for (initialization; condition; update) { statements }. Three parts control initialization, termination, and increment.
Flashcard 32: What is the purpose of using else after if?
Answer: To execute code when the if condition is false. Provides alternative path when condition is false.
Flashcard 33: Identify the keyword that ends a switch case.
Answer: break. Prevents fall-through to subsequent cases.
Flashcard 34: Determine the output: int i = 0; do { System.out.print(i); } while (i > 0);
Answer:
Flashcard 35: Which loop condition form ensures a loop runs zero or more times?
Answer: while loop. Condition checked before execution, may not run at all.
Flashcard 36: What is the significance of the loop condition?
Answer: Determines when the loop stops. Controls whether loop continues or terminates.
Flashcard 37: Determine the output: int x = 5; if (x < 5) { x--; } System.out.print(x);
Answer:
Flashcard 38: Identify the error: if (x = 5) { ... }
Answer: Use == instead of =. Single equals is assignment, not comparison.
Flashcard 39: Identify the error: for (int i = 0; i < 5; i++) { System.out.print(i); }
Answer: No error. Syntax is correct for standard for loop.
Flashcard 40: What is the purpose of a selection statement in programming?
Answer: To execute code based on a condition. Allows programs to make decisions and branch execution paths.
Flashcard 41: What does the continue statement do in a loop?
Answer: Skips the current iteration and continues with the next. Jumps to next iteration without executing remaining code.
Flashcard 42: Identify the error: while (true); { System.out.print("Loop"); }
Answer: Semicolon after true creates an infinite loop. Empty statement after while creates infinite loop.
Flashcard 43: What is an iteration in the context of loops?
Answer: A single execution of the loop body. One complete pass through the loop body.
Flashcard 44: Identify the keyword that ends a switch case.
Answer: break. Prevents fall-through to subsequent cases.
Flashcard 45: What are nested loops?
Answer: Loops within loops. One loop contained inside another loop's body.
Flashcard 46: Which loop always executes its block at least once?
Answer: do-while loop. Condition is checked after execution, guaranteeing one run.
Flashcard 47: What is the result of 5 % 2?
Answer:
Flashcard 48: Find the error: for (int i = 0; i < 10; i--)
Answer: i-- should be i++. Decrement creates infinite loop since i never reaches 10.
Flashcard 49: What is the default case in a switch statement?
Answer: Executed if no case matches. Catches all unmatched values in switch statement.
Flashcard 50: What keyword is used to define multiple selections in a switch statement?
Answer: case. Each case represents a possible match value.
Flashcard 51: What is the result of the expression: 4 >= 4?
Answer: true. Greater than or equal to includes equality.
Flashcard 52: How many times will this loop execute? for (int i = 0; i < 5; i++)
Answer: 5 times. Loop runs while i < 5: values 0, 1, 2, 3, 4.
Flashcard 53: What is the purpose of the else if statement?
Answer: To test multiple conditions in sequence. Chains conditions for multiple decision paths.
Flashcard 54: How is a for loop typically structured in Java?
Answer: for (initialization; condition; update) { statements }. Three parts control initialization, termination, and increment.
Flashcard 55: What does the continue statement do in a loop?
Answer: Skips the current iteration and continues with the next. Jumps to next iteration without executing remaining code.
Flashcard 56: What is the output of: if (false) { System.out.print("X"); }
Answer: No output. False condition means if block doesn't execute.
Flashcard 57: Identify the error: if (x = 5) { ... }
Answer: Use == instead of =. Single equals is assignment, not comparison.
Flashcard 58: What is the result of 5 % 2?
Answer:
Flashcard 59: What happens if break is omitted in a switch case?
Answer: Fall-through to next case occurs. Code continues executing into subsequent cases.
Flashcard 60: What is the result of: boolean b = (2 < 3) && (3 > 2);
Answer: true. Both conditions are true, AND returns true.
Flashcard 61: Determine the output: int x = 5; if (x < 5) { x--; } System.out.print(x);
Answer:
Flashcard 62: Which statement is used to skip an iteration in a loop?
Answer: continue. Bypasses remaining code in current iteration.
Flashcard 63: What is the purpose of using else after if?
Answer: To execute code when the if condition is false. Provides alternative path when condition is false.
Flashcard 64: Identify the error: switch (x) { case 1: System.out.print(1); }
Answer: Missing break statement. Without break, execution continues to next case.
Flashcard 65: Determine the output: int x = 0; while (x < 2) { x++; } System.out.print(x);
Answer:
Flashcard 66: Identify the error: switch (x) { case 1: System.out.print(1); }
Answer: Missing break statement. Without break, execution continues to next case.
Flashcard 67: What is the output of: if (true) { System.out.print("A"); } else { System.out.print("B"); }
Answer: A. True condition executes the if block.
Flashcard 68: Identify the error: while (true); { System.out.print("Loop"); }
Answer: Semicolon after true creates an infinite loop. Empty statement after while creates infinite loop.
Flashcard 69: What does an if-else statement do?
Answer: Executes code blocks based on condition being true or false. Provides branching logic for conditional execution.
Flashcard 70: What happens if break is omitted in a switch case?
Answer: Fall-through to next case occurs. Code continues executing into subsequent cases.
Flashcard 71: What is the purpose of the else if statement?
Answer: To test multiple conditions in sequence. Chains conditions for multiple decision paths.
Flashcard 72: Identify the keyword used for creating a loop in Java.
Answer: for, while, or do-while. These are the three main loop keywords in Java.
Flashcard 73: What is the purpose of a selection statement in programming?
Answer: To execute code based on a condition. Allows programs to make decisions and branch execution paths.
Flashcard 74: Which statement is used to skip an iteration in a loop?
Answer: continue. Bypasses remaining code in current iteration.
Flashcard 75: What is the syntax for a do-while loop in Java?
Answer: do { statements } while (condition);. Body executes first, then condition is checked.
Flashcard 76: What does an if-else statement do?
Answer: Executes code blocks based on condition being true or false. Provides branching logic for conditional execution.
Flashcard 77: What keyword is used to exit a loop prematurely?
Answer: break. Immediately terminates loop execution.
Flashcard 78: What are nested loops?
Answer: Loops within loops. One loop contained inside another loop's body.
Flashcard 79: What is the output of: if (false) { System.out.print("X"); }
Answer: No output. False condition means if block doesn't execute.
Flashcard 80: What is the output of: if (true) { System.out.print("A"); } else { System.out.print("B"); }
Answer: A. True condition executes the if block.