Mastering Logic and Control Structures

What is the output of the following code: for (int i = 0; i < 3; i++) { for (int j = 0; j < 2; j++) { System.out.print(i + j + " "); } }?

• 0 1 2 3 3 4

• 1 2 2 3 3 4

• 0 1 1 2 2 3

• 0 1 1 2 2 4

Explain how variable scope affects the accessibility of a variable defined inside a loop.

• A variable defined inside a loop is accessible globally.

• A variable defined inside a loop is only accessible within that loop's scope.

• A variable defined inside a loop can be accessed outside the loop after it ends.

• A variable defined inside a loop is accessible in all functions.

Given the following code, what will be the final value of 'x'? int x = 5; for (int i = 0; i < 3; i++) { x += i; }

• 10

• 8

• 7

• 6

What is the result of the expression: (3 + 4 * 2) / (1 - 5) + 2?

• -2

• 0.25

• -0.75

• 1.5

How can you optimize a nested loop that iterates over a large dataset to improve performance?

• Use nested loops for all operations

• Ignore data filtering

• Use hash maps for lookups, reduce loop iterations, and consider parallel processing.

• Increase the number of iterations

What will be the output of the following code snippet: int a = 10; if (a > 5) { a += 5; } else { a -= 5; } System.out.println(a);?

• 5

• 15

• 10

• 20

Describe a scenario where a variable defined in an outer loop is modified by an inner loop. What implications does this have?

• Modifying a variable in an inner loop has no effect on the outer loop.

• Variables in an outer loop are always constant during execution.

• A variable in an outer loop can be modified by an inner loop, affecting the outer loop's outcome.

• An inner loop cannot access variables from an outer loop.

What is the output of the following code: for (int i = 0; i < 5; i++) { if (i % 2 == 0) { System.out.print(i + " "); } }?

• 0 2 4

• 1 3 5

• 0 2 3

• 2 4 6

How does operator precedence affect the evaluation of the expression: 5 + 3 * 2 - 1?

• 10

• 8

• 12

• 6

What will happen if you try to access a variable defined inside a loop from outside that loop?

• The variable will retain its value outside the loop.

• You will encounter a reference error or undefined variable error.

• You will get the value of the variable as null.

• The variable will be accessible globally.