题目内容

In computer programming, data values used to signal either the start or end of a data series are called ____.

A. input values
B. limits
C. sentinels
D. iterators

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In Unix operating systems, the EOF mark is generated whenever the ____ keys are pressed simultaneously.

A. Ctrl and D
B. Ctrl and E
Ctrl and F
D. Ctrl and Z

In IBM-compatible computers, the EOF mark is generated whenever the ____ keys are pressed simultaneously.

A. Ctrl and D
B. Ctrl and E
Ctrl and F
D. Ctrl and Z

The ____ statement is similar to the break statement but applies only to loops created with while, do-while, and for statements.

A. stop
B. loop
C. exit
D. continue

The statement ____ is a null statement.

A. break;
B. continues
C. ;