Algorithms with Selection and Repetition：练习题

How many times will the following loop execute?
for (int i = 0; i < 10; i += 3) {
  System.out.println(i);
}

Given that a, b, and c are boolean variables, which of the following expressions will always evaluate to the same value as (a && b) || (a && c)?

A student is writing a program to find the largest power of 2 that is less than or equal to a positive integer n. Which of the following code segments correctly computes this value and stores it in ans?

Which of the following logical expressions is equivalent to the expression !(a || b) according to De Morgan's Laws?

What is the output of the following code segment?
int count = 0;
for (int i = 1; i <= 3; i++) {
  for (int j = 1; j < 3; j++) {
    count++;
  }
}
System.out.println(count);

A program is designed to analyze a sequence of integers entered by a user until the user enters -1.
Part a: Using a while loop, write a logic flow that calculates the sum of all positive even integers entered.
Part b: Integrate an if-else structure to track the maximum value among the entered positive integers.
Part c: If the user enters the sequence: 4, 7, 2, 10, -1, determine the final values of the sum and the maximum. Show the state of these variables after each iteration.