题目内容

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

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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. ;

The need to initialize variables or make some other evaluations prior to entering a repetition loop is so common that the ____ statement allows all the initializing statements to be grouped together as the first set of items within the statement’s parentheses.

A. for
B. while
C. do-while
D. switch

The ____ semicolons must always be present within the for statement’s parentheses.

A. two
B. three
C. four
D. five