Which of the following will print the tens column of an integer stored in x?
以下哪项将打印存储在 x 中的整数的十位数？

Question

BlackTom AI · Accepted Answer

Let's evaluate what printing the tens digit means in a typical integer value stored in x. The tens digit is the second digit from the right (the digit in the 10s place).
Option 1: System.out.print(x / 10 % 10); This works because x / 10 removes the ones place (shifts right by one decimal place in integer division), and then % 10 extracts the least significant digit of what remains, i.e., the original tens digit. This is the standard way to isolate the tens place.
Option 2: System.out.print(x % 10 / 10); Here, x % 10 gives the ones digit (or a negative remainder for negative x), and dividing that by 10 will yield 0 in integer division for any |x| < 10, and generally does not yield the tens digit. Therefore this does not produce the tens digit.
Option 3: System.out.print(10 % x); This computes the remainder of 10 divided by x, which has nothing to do with the tens place of x. It’s unrelated to extracting digits of x.
Option 4: System.out.print(x / 10); This prints the value of x without its last digit, i.e., the number formed by removing the ones place, not just the tens digit. If x is 123, this would print 12, not 2.
Option 5: None of the above. Since Option 1 correctly extracts the tens digit, this option is incorrect.
In summary, Option 1 is the correct expression for printing the tens column of the integer stored in x, while the other options fail to isolate the tens place for the reasons described above.

(862646) AP CS A Unit 1 Exam 第一单元考试

Which of the following will print the tens column of an integer stored in x? 以下哪项将打印存储在 x 中的整数的十位数？

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