C语言中关于字符串的编程

#include<stdio.h>
#include<string.h>
char res[100][100];
int t;
int main()
{
    char s[100];
    
    int inword=0;
    int word=0;
    int k=0;
     gets(s);
     int i=0;
     int post=0;
      
    while(s[i]!='.')
    {
        if(s[i]!=' ' && s[i]!='.')//此时说明是字母
        {
            for(post=i;s[post]!=' ' && s[post]!='.';post++)
                res[word][k++]=s[post];         
        }
         res[word][k]='\0';
        if(s[post]=='.')
        {
            res[word][k]='\0';
            break;
        }
          
        i=post+1;