Begining C中文第五版第六章217页，例子6.7中对strtok_s使用了4个参数(str,str_size,delimiters,ptr)
代码如下：

// Program 6.7 Find all the words
#define __STDC_WANT_LIB_EXT1__ 1 // Make optional versions of functions available
#include <stdio.h>
#include <string.h>
#include <stdbool.h>
int main(void)
{
char delimiters[] = " \".,;:!?)("; // Prose delimiters
char buf[100]; // Buffer for a line of keyboard input
char str[1000]; // Stores the prose to be tokenized
char* ptr = NULL; // Pointer used by strtok_s()
str[0] = '\0'; // Set 1st character to null
size_t str_len = sizeof(str);
size_t buf_len = sizeof(buf);
printf("Enter some prose that is less than %zd characters.\n"
"Terminate input by entering an empty line:\n", str_len);
// Read multiple lines of prose from the keyboard
while(true)
{
if(!gets_s(buf, buf_len)) // Read a line of input
{
printf("Error reading string.\n");
return 1;
}
if(!strnlen_s(buf, buf_len)) // An empty line ends input
break;
if(strcat_s(str, str_len, buf)) // Concatenate the line with str
{
printf("Maximum permitted input length exceeded.\n");
return 1;
}
}
printf("The words in the prose that you entered are:\n", str);
// Find and list all the words in the prose
unsigned int word_count = 0;
char * pWord = strtok_s(str, &str_len, delimiters, &ptr); // Find 1st word
if(pWord)
{
do
{
printf("%-18s", pWord);
if(++word_count % 5 == 0)
printf("\n");
pWord = strtok_s(NULL, &str_len, delimiters, &ptr); // 编译出错的地方，编译器报错不应该有4个参数
}while(pWord); // NULL ends tokenizing
printf("\n%u words found.\n", word_count);
}
else
printf("No words found.\n");
return 0;
}

我在微软官网文档上找到的的sample经过检验，可以顺利编译
代码如下：

// crt_strtok_s.c
// In this program, a loop uses strtok_s
// to print all the tokens (separated by commas
// or blanks) in two strings at the same time.
//

#include <string.h>
#include <stdio.h>

char string1[] =
    "A string\tof ,,tokens\nand some  more tokens";
char string2[] =
    "Another string\n\tparsed at the same time.";
char seps[]   = " ,\t\n";
char *token1 = NULL;
char *token2 = NULL;
char *next_token1 = NULL;
char *next_token2 = NULL;

int main( void )
{
    printf( "Tokens:\n" );

    // Establish string and get the first token:
    token1 = strtok_s( string1, seps, &next_token1);
    token2 = strtok_s ( string2, seps, &next_token2);

    // While there are tokens in "string1" or "string2"
    while ((token1 != NULL) || (token2 != NULL))
    {
        // Get next token:
        if (token1 != NULL)
        {
            printf( " %s\n", token1 );
            token1 = strtok_s( NULL, seps, &next_token1);
        }
        if (token2 != NULL)
        {
            printf("        %s\n", token2 );
            token2 = strtok_s (NULL, seps, &next_token2);
        }
    }
}

请问这个是什么原因呢？是书上写错了吗？

另外还有一个问题就：
strtok_s( NULL, seps, &next_token1);//第三个参数为什么要取地址符呢？