有以下程序：
#include ＜stdio.h＞
main()
int c；
while((c=getchar())!='\n')
switch(c-'2')
case 0：
case 1:putchar(c+4)；
case 2:putchar(c+4);break;
case 3:putchar(c+3);
case 4:putchar(c+3);break;
printf(''\n'');
从第一列开始输入以下数据(＜CR＞代表一个回车符)：
2743＜CR＞
程序的输出结果是
A) 66877
B) 668966
C) 6677877
D) 6688766
参考答案：A
解析： 本题主要考查字符输入输出函数getchar和putchar的使用。getchar函数用来从标准输入设备上读入一个字符，putchar(c)函数是将字符变量c中的字符输出到标准输出设备上，并且字符可以看作整数参与运算。
| 完形填空。 | |||
| "I don't like my parents. They always tell me I should 1 this, and shouldn't do that. It often makes me unhappy,"said Zhang Li, a middle school student. Do you have the same problem 2 ZhangLi? Why aren't some parents so 3 ? On one hand, parents do a lot for you. They worry about your choice of friends, the food you eat and your study at school. 4 these things are part of your life. Don't blame (责备) them. They want you to 5 up healthily and happily. On the other hand, you 6 introduce your friends to your parents. Let them 7 you are making good friends. 8 them If you stay outside 9 than usual. Don't always argue 10 them. Talk about your ideas with them. You'll understand them when you become a parent in the future. | |||
| ( )1. A. study ( )2. A. about ( )3. A. friendly ( )4. A. Both ( )5. A. stay ( )6. A. shouldn't ( )7. A. know ( )8. A. Surprise ( )9. A. early ( )10. A. with | B. make B. as B. unpleasant B. Whole B. wake B. should B. look B. Remember B. late B. for | C. do C. like C. scared C. All C. keep C. must C. think C. Call C. earlier C. in | D. learn D. to D. busy D. Every D. grow D. needn't D. think D. Talk D. later D. on |