如何使用 scanf() 扫描包含空格的字符串? [英] How can I scan strings with spaces in them using scanf()?

问题描述

我想编写一个子程序，用户可以在其中输入他们的评论.我使用 scanf("%s", X) 并让他们输入注释，但它只能存储字符串中空格键之前的单词.

I want to write a sub-program in which a user can input their comment. I use scanf("%s", X) and let them input a comment, but it can only store the word before a space bar in the string.

如何解决这个问题，以便将整个句子存储到字符串或文件中?

How can I solve this problem in order to store a whole sentence into a string or a file?

我的代码如下:

FILE *fp;
char comment[100];
fp=fopen("comment.txt","a");
printf("You can input your comment to our system or give opinion to the musics :
");
scanf("%s",comment);
fputs(comment,fp);

推荐答案

而不是告诉你不要使用 scanf() 的答案，你可以否定扫描集 scanf() 选项:

Rather than the answers that tell you not to use scanf(), you can just the the Negated scanset option of scanf():

scanf("%99[^
]",comment); // This will read into the string: comment 
                           // everything from the next 99 characters up until 
                           // it gets a newline

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