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问题 单项选择题

分析下列程序： #include＜stdio.h＞ main() { int*p1,*p2,*p;int a=6,b=9;p1=&a;p2=&b;if(a＜b){p=p1;p1=p2;p2=p;}printf("%d,%d",*p1,*p2);printf("%d,%d",a,b); } 程序的输出结果为( )。

A．9,6 6,9

B．6,9 9,6

C．6,9 6,9

D．9,6 9,6

答案

参考答案：A

解析：
通过p1=&a，p2=&b分别将a、b的地址赋给指针p1、p2，接着执行if语句，发现a＜b成立，则通过交换p1、p2的值，即交换a、b所在存储单元的地址，但是a、b的值并没有发生变化。

默写题

背一背，填一填。

（1）非淡泊无以明志，________________。

（2）兄弟敦和睦，________________。

（3）________________，处处细留心。

（4）书犹药也，________________。

（5）读书有三到，谓_________、_________、口到。
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单项选择题

Now that you’ve gotten a little more confident, we’re going to give you the opportunity to practice "without the training wheels." When you want to check your work, you can turn to the solutions at the end. If you aren’t familiar with some of the mathematical concepts, make a note to pay particular attention to that chapter in this book; this practice set covers a wide range of topics tested on the GMAT.
On all data sufficiency problems, the answer choices are the same (as you’ve learned). We’ve put them here for your reference.
Ａ. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Ｂ. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
Ｃ. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
Ｄ. EACH statement ALONE is sufficient.
Ｅ. Statements (1) and (2) TOGETHER are NOT sufficient.

If the square root of t is a real number, is the square root of t positive
(1) t＞0
(2) t2＞0
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