程序代码：

#define _STDC_WANT_LIB_EXT1_1
#include "stdio.h"
#include "string.h"
#include "stdlib.h"
#define capacity 50
void convert(char*, char str[]);
void rtern(char str[]);
int main(void)
{
    char *ptr = (char*)malloc(capacity);
    char buf[capacity] = { NULL };
    printf("请输入一串字符:\n");
    fgets(ptr, capacity, stdin);
    convert(ptr, buf);
    rtern(buf);
    free(ptr);
    ptr = NULL;
    return 0;
}


void convert(char* p, char word[])
{
    char delimiters[] = " \" ,;:)( ";
    char buf[capacity];
    char *ptr = NULL;

    strcpy_s(buf, capacity, p);
    char *pstr = strtok_s(buf, delimiters, &ptr);

    //就是下面这句，怎样彻底单元化一个字符串
    while  (pstr !=NULL)
    {
        if (pstr!=NULL)
            pstr = strtok_s(NULL, delimiters, &ptr); 
        
    }
    free(p);//删去free也错
    p= NULL;


    strcpy_s(word, capacity, pstr);
    printf("%s\n", word);
}


void rtern(char* q)
{
    printf("%d\n", strlen(q));
}