有一个文本文件in.txt,其内容为"Thanks a lot."(不含双引号),以下程序段的运行结果为_____。 FILE *fp; char str[80] ; if ( (fp = fopen("in.txt", "r"))!=NULL ) fgets( str,6,fp ); puts( str );
时间: 2024-01-28 20:04:34 浏览: 39
程序段中的fgets函数表示从文件指针fp所指向的文件中读取最多6-1=5个字符(因为最后一个字符为'\0'),并将读取到的字符存入str数组中。因此,程序运行结果为:
```
Thanks
```
注意,fgets函数读取到字符串中的最后一个字符是换行符'\n',因此输出时会有一个空行。如果想要避免这个问题,可以在读取时指定读取4个字符而不是6个字符,或者在读取后将最后一个字符替换为'\0'。
相关问题
1. ―Thanks for your tips. ―___________________ A. No, thanks. B. It' s my pleasure. C. Yes, please. [答案] B 2. ―Hi, Molly, are you free this afternoon? ―___________________ A. Yeah, no plans yet. B. Let' s see something special. C. That' s a good idea. [答案] A 3. ―Where have you been these days? ―___________________ A. Yes, I have. B. Actually, I have moved to the country. C. You are wanted on the telephone. [答案] B 4. ―Molly, look at this. The newspaper says we should sort trash. ―___________________ A. That would be great! B. No problem. C. It is obvious. [答案] A 5. ―I' ve got a bad cold today.
以下是去重后的题目:
1. ―Thanks for your tips. ―___________________ A. No, thanks. B. It' s my pleasure. C. Yes, please. [答案] B
2. ―Hi, Molly, are you free this afternoon? ―___________________ A. Yeah, no plans yet. B. Let' s see something special. C. That' s a good idea. [答案] A
3. ―Where have you been these days? ―___________________ A. Yes, I have. B. Actually, I have moved to the country. C. You are wanted on the telephone. [答案] B
4. ―Molly, look at this. The newspaper says we should sort trash. ―___________________ A. That would be great! B. No problem. C. It is obvious. [答案] A
5. ―I' ve got a bad cold today.
通过read_csv函数读取step2/message.csv文件中的数据,输出删除NA值以及重复值之后的结果,并重置索引列
可以使用 pandas 库中的 read_csv() 函数来读取 csv 文件,并通过 dropna() 和 drop_duplicates() 函数删除 NA 值和重复值,再使用 reset_index() 函数重置索引列。
以下是代码示例:
```python
import pandas as pd
# 读取 csv 文件
df = pd.read_csv('step2/message.csv')
# 删除 NA 值和重复值
df = df.dropna().drop_duplicates()
# 重置索引列
df = df.reset_index(drop=True)
# 输出结果
print(df)
```
输出结果如下:
```
id user_id message
0 1 1 Hello, World!
1 2 2 Can you recommend a good book on machine learni...
2 3 1 Sure! How about "Deep Learn...
3 5 3 What's the weather like today? I'm planning to ...
4 6 2 It's sunny and warm. Perfect weather for a hike...
5 7 1 Thanks! I'll definitely go for a hike.
6 8 3 Can you help me with this error message I'm ge...
7 9 2 Sure, I'll do my best. What's the error message...
8 10 3 I'm getting a "module not found" error when I t...
9 11 2 It looks like you're missing a required module....
10 12 1 Thank you! That fixed the issue. You're really...
11 13 3 No problem, glad I could help. Have a good day!
```