字符常量中有一类以（）开始的特殊的常量称为转义字符，这些转义符有固定的含义。
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putchar() 函数是字符输出函数，其功能是在显示器上输出（）个字符常量或字符变量的值。
Select the correct statement.
A. Break ends the loop, ignoring the loop condition
Break ends the loop, ignoring all further statements
Continue goes back to the start of the loop
D. All of the above
range(3) creates a sequence of which numbers?
A. [1,2,3]
B. [0,1,2,3]
C. [0,1,2]
D. [1,2]
range(2,5) creates a sequence of which numbers?
A. [0,2,4]
B. [2,3,4,5]
C. [2,3,4]
D. [2,4]
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