1) In C++, a legal identifiers may contain these kinds of characters ___________

Question

1) In C++, a legal identifiers may contain these kinds of characters _______________, ______________, ______________

2) Pick the C++ keywords out of the following list.

a) while

b) total_weight

c) double

d) if

e) number_of_bars

3) Which of the following are legal definitions with initializations? (Consider each line to be in a different scope so there is no multiple definition of identifiers.)

a) int count = 0, limit = 19;

b) int count(0), limit(19);

c) int count = 0, limit(19);

d) int limit = 19;

e) int namespace(0);

4) The value of the expression 20.0 * (9/5) + 32.0 is

a) 68.0

b) 52.0

c) expression has a syntax error so there is no value

d) 32.0

e) an incorrect expression, the / should be %

Explanation / Answer

Solution:

1. In C++, a legal identifiers may contain these kinds of characters

Ans: digits,(0-9) underscore (_) , alphabets (a-z)

Note: But the identifier name can not be start from the digit but it can start from underscore and alphabets.

2. Pick the C++ keywords out of the following list.

Ans: double, if, while

3. Which of the following are legal definitions with initializations? (Consider each line to be in a different scope so there is no multiple definition of identifiers.)

Ans: int count = 0, limit = 19;
int limit = 19;

4. The value of the expression 20.0 * (9/5) + 32.0 is

Ans: 52.0

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