#include <stdio.h>
void main()
{
    //file *fpt;
    FILE *fpt;
    int count=0,space=1;
    char ch,filename[20];
    printf("Input the filename:");
    //getchar(filename);
      gets(filename);
    if((fpt=fopen(filename,"r"))=NULL)
    {
        printf("Can't open file %s\n",filename);
        return;
    }
    //while((ch=fputc(fpt))==EOF)
    while((ch=fgetc(fpt))!=EOF)
    switch(ch)
    {
    case ' ':
    case '\t':
    //case '\n': space=0;
    case '\n':space=1;
        break;
    default: if(space)
             {
                 space=0;
                 count++;
             }
    }
    //close(fpt);
    fclose(fpt);
    printf("File '%s' contains %d words.\n",filename,count);
}

#include <stdio.h>
void main()
{
    //file *fpt;
    FILE *fpt;
    int count=0,space=1;
    char ch,filename[20];
    printf("Input the filename:");
    //getchar(filename);
      gets(filename);
    if((fpt=fopen(filename,"r"))=NULL)         <-------------------把这里的＝改成＝＝就OK了！
    {
        printf("Can't open file %s\n",filename);
        return;
    }
    //while((ch=fputc(fpt))==EOF)
    while((ch=fgetc(fpt))!=EOF)
    switch(ch)
    {
    case ' ':
    case '\t':
    //case '\n': space=0;
    case '\n':space=1;
        break;
    default: if(space)
             {
                 space=0;
                 count++;
             }
    }
    //close(fpt);
    fclose(fpt);
    printf("File '%s' contains %d words.\n",filename,count);
}