Trace the output of the following C# code. int i = 5; int j = 10; MessageBox.Show((i j).ToString());

Question

Trace the output of the following C# code. int i = 5; int j = 10; MessageBox.Show((i > j).ToString());

BlackTom AI · Accepted Answer

We start by restating the given code and the possible outputs to consider.

Code snippet:
int i = 5;
int j = 10;
MessageBox.Show((i > j).ToString());

Option a: Error
- This option would be correct if there were a compile-time or runtime error in the code. However, the comparison i > j between two integers is valid in C#. The expression evaluates to a boolean value, and calling ToString() on a bool is perfectly valid. Therefore, there is no error in this code.

Option b: True
- This option would be correct if the comparison i > j evaluated to true. Since i is 5 and j is 10, the comparison 5 > 10 is false. A common misconception here is confusing the values or misreading the operator; the greater-than operator checks if the left-hand value is strictly greater than the right-hand value, which is not the case for 5 and 10.

Option c: 5
- This option would be correct if the expression i > j somehow produced the numeric value 5. However, (i > j) is a boolean expression, not a numeric expression. After evaluating to false, the ToString() method converts the boolean false to the string "False". There’s no path in this code that would yield the literal 5.

Option d: False
- This option corresponds to the string result produced by ToString() when the boolean value is false. Since i (5) is not greater than j (10), the comparison i > j evaluates to false. The ToString() call on a boolean value yields the textual representation "False". This aligns with how booleans are serialized to strings in C#.

Additional notes and common pitfalls:
- Remember that ToString() on a bool returns either "True" or "False" with an initial capital letter, exactly as expected in C#.
- The code does not attempt to show a numeric result or an error; it only shows the string produced by converting the boolean result of the comparison.
- If you mistakenly think the operator yields a numeric result or confuse the operands, you might produce an incorrect option like 5 or True, but the actual boolean result is False for the given values.

Trace the output of the following C# code. int i = 5; int j = 10; MessageBox.Show((i > j).ToString());单项选择题

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