Question

Consider the following code segment.

int num = 2574;
int result = 0;
while (num > 0)
{
result = result * 10 + num % 10;
num /= 10;
}
System.out.println(result);

What is printed as a result of executing the code segment?

Answer 1

The code reverses the digits of the number 2574, resulting in the output 4752, which is printed to the console.

Step-by-step explanation:

The student has presented a code segment in Java that performs a series of operations on an integer variable num. The code takes each digit of the number 2574 in reverse order and constructs a new number by adding each digit to the result multiplied by 10 on each iteration.

The initial value assigned to the variable num is 2574, and to result is 0. Each iteration of the loop will:

• Take the last digit of num by using the modulus operator (% 10),
• Add it to result after multiplying the current result by 10, effectively shifting the digits of result to the left and adding the new digit at the units place,
• Remove the last digit from num by dividing it by 10 (num /= 10).

After the while loop ends, the number 2574 is reversed to 4752, and that is the output printed to the console.