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【问题描述】5.15 任何一个大于6的偶数均可表示为2个素数之和。例如6=3+3,8=3+5,...,18=5+13。将6~100之间的偶数都表示成2个素数之和,打印时一行打印5组。素数就是只能被1和自身整除的正整数,最小的素数是2。要求定义并调用函数prime(m)判断m是否为素数,当m为素数时返回1,否则返回0。 【提示】使用sqrt函数时注意参数类型为浮点型。 【输入输出样例】 【样例说明】 输出结束后不需要换行。 按从小到大、每组五行。 每组的格式为:%4d=%2d+%2d。 等号和加号两侧无空格。
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举一反三
【单选题】赋值语句 a = 123 + Mid ( "123456" , 3 , 2 )执行后,变量 a 的值是 ________ 。
A.
"12334"
B.
123
C.
12334
D.
157
【单选题】—No dessert for me, please. I’m on ____ diet. —Why not just take one bite of ____cheese cake? I’m sure you will love it.
A.
a; a
B.
/; the
C.
a; the
D.
/; a
【单选题】— I wonder if I could possibly use your car for tonight. — ________.I'm not using it anyhow. [ ]
A.
Sure, go ahead
B.
I don't know
C.
Yes, indeed
D.
I don't care
【单选题】—I’d like to invite you to my new house next weekend. —Thank you, but ____ I’ll have time I’m not sure at the moment.
A.
when
B.
as
C.
in case
D.
unless
【单选题】赋值语句:a=123 & Mid("123456", 2, 2)执行后,a变量的值是( )。
A.
12323 (字符型)
B.
123
C.
12323 (数值型)
D.
157
【单选题】—I’m so anxious about my driving test tomorrow. Would you please give me some advice? —_____. I’m sure you are good enough to pass it. Be confident of yourself.
A.
Absolutely
B.
Take it easy
C.
You are right
D.
Not really
【单选题】—My recorder is broken. Could I use yours? —_______, but you have to return it tomorrow.
A.
I’m not sure
B.
No problem
C.
I’m sorry
D.
I hope so
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