c++ - 使用字符数组调用 scanf_s()

Question

我试过这段代码，但它不起作用。

char word1[40];
printf("Enter text: \n");
scanf_s("%s", word1);
printf("word1 = %s", word1);

当我执行它时，它显示:

word1 = 

Answer 1

如果您仔细阅读MSDN documentation of scanf_s() ，您会注意到您必须提供字符串缓冲区的长度:

Unlike scanf and wscanf, scanf_s and wscanf_s require the buffer size to be specified for all input parameters of type c, C, s, S, or string control sets that are enclosed in []. The buffer size in characters is passed as an additional parameter immediately following the pointer to the buffer or variable.

调整你的scanf_s()调用如下:

scanf_s("%s", word1, _countof(word1));

这应该有效。

(注意 _countof() 需要包括 <stdlib.h> 。)