3.11. Medium Multiple Choice Questions¶

These problems are similar to those you will see on the AP CS A exam.

3-10-1: Which of the following would be the correct result from the following expression: 123 (decimal) - 12 (octal) + 111 (binary)?

222
That would be the answer if these were all decimal values, but they are not.
120
12 in octal is 10 in decimal and 111 in binary is 7 in decimal so this is 123 - 10 + 7.
118
This would be the answer if it was 123 - 12 + 111 (binary) but the 12 is in octal.
121
Remember that the rightmost digit in any base is the base to the 0th power which is 1.
214
Remember that the 111 is in binary (base 2). Its decimal value is 7.

3-10-2: What will be printed by System.out.println(Integer.MAX_VALUE + 1);?

2147483647
This would be true if it was printing just the maximum integer value.
0
This might make sense, but adding one to the maximum integer value gives the minimum integer value.
There will be a compile time error
It will compile, but what will it do when you run it?
-2147483648
Adding one to the maximum integer value gives the minimum integer value due to overflow.
There will be a run time error
This makes sense, but it is not what happens.