如何阻止在此实例中添加空行？

如何解决如何阻止在此实例中添加空行？

我正在尝试这样做，以便您可以编写多行消息，并将其存储在您选择的文件中，然后输入`，但是当我在顶部执行此操作时，会打印一个空行。我怎样才能防止这种情况？

#include <stdio.h>
char filename[BUFSIZ];
char input[BUFSIZ];
FILE *file;
int main() {
        printf("What do you want to name the file?\n");
        scanf("%s",filename);
        printf("Enter the contents. Once you are done enter `\n");
        scanf("%[^`]s",input);
        file = fopen(filename,"w");
        fprintf(file,"%s",input);
        fclose(file);
}

解决方法

代码：

/* multi.c
 */

#include <stdio.h>

#define BUFSIZE     1024

int main(void)
{
    char filename[BUFSIZE];
    char input[BUFSIZE];
    FILE *fp;

    /* using fprintf(stderr... is better because of output buffering.
     * This way,we don't need the '\n' at the end for the string to
     * appear in the console. You could also use:
     *
     * printf("Filename: "); fflush(stdout);
     */
    fprintf(stderr,"Filename: ");

    /* When you press ENTER,a '\n' will be created at the stdin buffer.
     * However,this scanf() will NOT read it into @filename. So the '\n'
     * is left in the buffer...
     */
    scanf("%s",filename);

    fprintf(stderr,"Contents: ");
    /* when you call scanf() again,the old '\n' is the first character
     * it reads into @input. So,to discard that,simply add a space
     * before the % - this ignores whitespaces (tabs,newlines,spaces)
     */
    scanf(" %[^`]",input);

    /* open the file,check for errors */
    if(!(fp = fopen(filename,"w"))) {
        perror("fopen");
        return -1;
    }

    /* print the contents to the file */
    fprintf(fp,"%s",input);

    /* clean up */
    fclose(fp);
    return 0;
}

这是执行：

$ ./multi
Filename: hello.txt
Contents: My name is Enzo
I am writing some multiline content to a file
And then I'm posting it to
Stack Overflow.`

这是 hello.txt

$ cat hello.txt
My name is Enzo
I am writing some multiline content to a file
And then I'm posting it to
Stack Overflow.$

请注意，在最后一行之后，我的终端字符 $ 在那里。这是因为我们以 ` 字符结束输入，而不是换行。因此，文件末尾没有换行符。

int main() {
    printf("What do you want to name the file?\n");
    scanf(" %s",filename);
    printf("Enter the contents. Once you are done enter `\n");
    scanf(" %[^`]s",input); //do not forget to put a space in scanf
    file = fopen(filename,"w");
    fprintf(file," %s",input); //try to make a space in there or if it doesn't work
    fclose(file);                //than try " %[^\n] but this is a little risky depends in the way you want use the code.
                                 //if none of these works than try this other way "\b %s"

}

始终在“%s”或其他文本格式说明符之前放置一个空格，因为您可能会遇到问题... 原因是当您在 printf() 之后直接添加 scanf() 时，有时它会将 scanf 作为字符串的一部分，它甚至必须读取 printf() 打印的最后一个字符，具体取决于它们是什么类型的字符（主要是空格，\n，\t）。这有点奇怪，但过去发生过很多次。我认为问题出在那里

scanf(" %[^`]s",input);  //put that white space

首先尝试在此处留出空间，我认为它会起作用，但如果它不尝试其他留在评论中的空间。其中之一肯定会起作用。