我在学习文件操作时遇到了的问题

Question

#include
#include
#include
void main()
{
FILE* fp;
char ch, filename[20];
printf("Please input the filename you want write:\n");
scanf_s("%s", &filename);

if (fopen(filename,"wt+")==NULL)
{
    printf("cannot open the file!\n");
        exit(0);
}
fp = fopen(filename, "wt+");
printf("Please input the sentence you want write:\n");
    ch = getchar();
    ch = getchar();
    while (ch != EOF)
    {
        fputc(ch, fp);
            ch = getchar();
    }
    fclose(fp);

}

警告 C6054 可能没有为字符串“filename”添加字符串零终止符。 ConsoleApplication1 D:\PROJECT\PROJECT5\CONSOLEAPPLICATION1\CONSOLEAPPLICATION1.CPP 26

这个弄不懂怎么解决..

Answer 1

scanf_S用错了。

scanf_s("%s",  filename, 20);