如何用c语言实现单词统计

#include <stdio.h>

#include <string.h>

#define SIZE 20

int main(){   

    char str[SIZE]={'\0'};  

    int count=0;

    printf("plz input the string\n");

    gets(str);

    puts(str);  

    int length = strlen(str); 

    for (int i=0;i<length;i++){

        if(str[i]!=' '){        

            count++;      

            while(str[i]!=' '&&str[i]!='\0'){

                i++;

            }

        }

    }

    printf("%d\n",count);

    return 0;

}