Write a C program for counting the number of words, lines, special characters in a given text

#include
#include
#include
#include

/*low implies that position of pointer is within a word*/
#define low 1 
/*high implies that position of pointer is out of word.*/
#define high 0 

void main()
{
int nob,now,nod,nov,nos,pos=high;
char *s;
nob=now=nod=nov=nos=0;
clrscr();

printf("Enter any string:");
gets(s);

while(*s!='')
{
if(*s==' ')  /* counting number of blank spaces. */
    {
    pos=high;
    ++nob;
    }
else if(pos==high) /* counting number of words. */
    {
    pos=low;
    ++now;
    }

if(isdigit(*s))   /* counting number of digits. */
    ++nod;
if(isalpha(*s))    /* counting number of vowels */
    switch(*s)
        {
        case 'a':
        case 'e':
        case 'i':
        case 'o':
        case 'u':
        case 'A':
        case 'E':
        case 'I':
        case 'O':
        case 'U':
        ++nov;
        break;
        }

/* counting number of special characters */
if(!isdigit(*s)&&!isalpha(*s))
    ++nos;

s++;
}

printf("nNumber of words %d",now);
printf("nNumber of spaces %d",nob);
printf("nNumber of vowels %d",nov);
printf("nNumber of digits %d",nod);
printf("nNumber of special characters %d",nos);

getch();
}