骑煞舍吼滔涎枫宝沥氮较膛鞠
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起止时间:2020-02-24到2020-12-31
更新状态:已完结
第3周——从键盘中来，到键盘中去，开始输入和输出啦 第一次课单元测试-单选题
1、 Which one is an invalid identifier as follows ().
A:abc123
B:No.1
C:123
D:OK
答案: No.1
2、 Which one is a valid identifier as follows ( ).
A:_buy_2
B:2_buy
C:? _buy
D:buy?
答案: _buy_2
3、 Which one is a valid identifier as follows ().
A:int Define WORD
B:a3_b3 _123 IF
C:For -ABC Case
D:2a do sizeof
答案: a3_b3 _123 IF
4、 Which one is not the keyword in C language () .
A:int
B:break
C:while
D:character
答案: character
5、 Which one is the keyword in C language ().
A:Float
B:signed
C:integer
D:Char
答案: signed
6、 Which one is right as follows ().
A:A c program is consisted of a main program and a number of sub-programs.
B:A c program is consisted of one or more functions.
C:A c program is consisted of a number of processes.
D:A c program several sub-programs.
答案: A c program is consisted of one or more functions.
7、 What is the unit of C program ().
A:Program Line
B:Statement
C:function
D:Character
答案: function
8、 Which one is wrong as
follows ().
A:Only one statement
can be written on a line.
B:Each function has a
function header and a function body, and the main function is no exception.
C:The main function can only call user
functions or system functions, and user functions may call each other.
D:A program is made up of several functions, but there must be, and only one, a main function.
答案: Only one statement
can be written on a line.
9、 Which one is right as
follows ().
A:A c language program always starts with
the first defined function.
B:The function to be called must be
defined in the main function.
C:A c language program
always starts with the main function.
D:The main function in the C language program must be placed at the beginning of the program.
答案: A c language program
always starts with the main function.
10、 What is the C
compiler ().
A:It is a machine
language version.
B:It is a set of
machine language instruction.
C:It is used to compile
the C source program into the target program.
D:It is a set of application software
provided by manufacturers.
答案: It is used to compile
the C source program into the target program.
11、 The ASCII code value of uppercase ‘A’ is 65, and the lowercase ‘a’ is 97, What is the value of character constant ‘ \101 ‘ ( ).
A:A
B:a
C:c
D:Illegal constants
答案: A
12、 Which one is correct escape character ( ). // escape character 转义字符
A:’ \ ‘
B:’ 018 ‘
C: ‘ xab ‘
D:’ \abc ‘
答案: ‘ \abc ‘
13、 Which
one is the correct character constant ().
A:”F”
B:’ \ ‘ ‘
C:’ W ‘
D: ”
答案: ‘ W ‘
14、 Which expression is
correct as follows ().int m=8,n, a, b; unsigned long w=10; double x=3.14, y=0.12;
A:a+=a-= (b=2) * (a=8)
B:n=n*3=18
C:x%3
D:y=float (m)
答案: a+=a-= (b=2) * (a=8)
15、 Which one is a
correct assignment expression as follows ().
A:a=9+b+c=d+9
B:a= (9+b, c=d+9)
C:a=9+b, b++, c+9
D:a=9+b++=c+9
答案: a= (9+b, c=d+9)
16、 If the ASCII code of
letter A is decimal number 65 and s is a character type,
What is the value of s, after the statement s= ‘ A ‘ + ‘ 6 ‘-‘ 3 ‘ is executed().
A: ‘d’
B:68
C:The indeterminate value
D:’D’
答案: ‘D’
17、 In C language, which
operator need the operation’s data type must be integer().
A:/
B:+ +
C:*=
D:%
答案: %
18、 Given: char s= ‘ /72
‘; which is right as follows ().
A:s contains a
character
B:s contains two
characters
C:s contains three
characters
D:The description is invalid,
the value of s is uncertain
答案: s contains a
character
19、 Given: int m=7; float
x=2.5, y=4.7; what is the value of the expression of x+m%3* (int) (x+y)%2/4 ().
A:2.500000
B:2.750000
C:3.500000
D:0.000000
答案: 2.500000
20、 Given float x; int m; the following can be implemented to retain the value in x two bits after the decimal point, and the third bit is the expression of the rounding operation is (). 设变量x为float类型，m为int类型，则以下能实现将x中的数值保留小数点后两位，第三位进行四舍五入运算的表达式是
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