以下哪种操作适用于条件判断？
Which of the following is suitable for conditional checking?

• if

• while

• for

• None / 这些都没有

如果 x = 0，以下 if 语句中哪个条件为真？
If x = 0, which condition in the following if statements are true?

• if (x)

• if (!x)

• if (x > 0)

• if (x < 0)

在以下哪种情况下，循环会被执行至少一次？
In which of the following cases will the loop be executed at least once?

• do-while

• for

• None / 这些都没有

• while

以下哪个运算符用于比较两个值？
Which operator is used to compare two values?

• &&

• ==

• -

• +

以下哪个关键字可以提前结束循环？
Which keyword can terminate a loop prematurely?

• continue

• break

• return

• exit

如果 for 循环条件永远为真会发生什么？
What happens if a for loop's condition always evaluates to true?

• 循环终止 / Loop terminates

• 无限循环 / Infinite loop

• 报错 / Error occurs

• 无法编译 / Fails to compile

以下哪种循环控制结构不属于 C 语言？
Which of the following loop control structures is NOT part of C language?

• foreach

• for

• while

• do-while

数组在内存中是如何存储的？
How are arrays stored in memory?

• 随机存储 / Randomly

• 连续存储 / Contiguously

• 逆序存储 / Reversely

• 哈希存储 / Hashed

如何访问数组中最后一个元素？
How can the last element of an array be accessed?

• arr[0]

• arr[n]

• arr[size-1]

• arr[-1]

以下哪个声明是有效的数组声明？
Which of the following is a valid array declaration?

• int arr[];

• int arr[10];

• arr[5] int;

• int[5] arr;