超星 - Quiz for Unit 6.4

单选题

Use the cppreference.com to see which is the data type of the return value of “sin()”?

A. float
B. double
C. int
D. long

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单选题

Use the cppreference.com to see which is the data type of the return value of “isspace()”?

A. float
B. double
C. int
D. long

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单选题

The expression “1 + (int)rand() % 52” can get the random numbers in the range of ( ).

A. 1 to 100.
B. 1 to 52.
C. 1 to 50.
D. 1 to 51.

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多选题

Before using the functions available in the system library, the programmer must know ( ).

A. The name of the function.
B. The arguments required by the function.
C. The data type of the returned value of the function.
D. A description of what each function does.
E. The header file where the prototype of the function is contained.

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