题目内容

total = total + num; is equivalent to ____.

A. total += num;
B. total =+ num;
C. total ++ num;
D. total +=+ num;

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____ is an accumulating statement.

A. total += num;
B. total++;
C. ++total;
D. total *= num;

Generally, before accumulating values, the accumulator variable should be initialized to ____.

A. -1
B. 1

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

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

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