C Program to Count number of words,digits,vowels using pointers

Write a program to count the number of words, lines and characters in a text

Program finding number of words, blank spaces, special symbols, digits, vowels using pointers

Count Number of Words using Pointer

#include<stdio.h>
#include<stdlib.h>
#include<ctype.h>
#include<conio.h>
/*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 *str;
   nob = now = nod = nov = nos = 0;
   clrscr();
   printf("Enter any string : ");
   gets(str);
   while (*str != '\0') {
      if (*str == ' ') {
         // counting number of blank spaces.
         pos = high;
         ++nob;
      } else if (pos == high) {
         // counting number of words.
         pos = low;
         ++now;
      }
      if (isdigit(*str)) /* counting number of digits. */
         ++nod;
      if (isalpha(*str)) /* counting number of vowels */
         switch (*str) {
            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(*str) && !isalpha(*str))
         ++nos;
      str++;
   }
   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();
}

#include<stdio.h>

#include<stdlib.h>

#include<ctype.h>

#include<conio.h>

/*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 *str;

nob = now = nod = nov = nos = 0;

clrscr();

printf("Enter any string : ");

gets(str);

while (*str != '\0') {

if (*str == ' ') {

// counting number of blank spaces.

pos = high;

++nob;

} else if (pos == high) {

// counting number of words.

pos = low;

++now;

}

if (isdigit(*str)) /* counting number of digits. */

++nod;

if (isalpha(*str)) /* counting number of vowels */

switch (*str) {

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(*str) && !isalpha(*str))

++nos;

str++;

}

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();

}

Output :

Enter any string : pritesh a taral from c4learn.com
Number of words 5
Number of spaces 4
Number of vowels 9
Number of digits 1
Number of special characters 5

Enter any string : pritesh a taral from c4learn.com

Number of words 5

Number of spaces 4

Number of vowels 9

Number of digits 1

Number of special characters 5

Explanation of Program :

Now we are going to accept string using gets(). We are not using scanf() to accept string because scanf() will accept string only upto whitespace.

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

1 2	printf("Enter any string:"); gets(str);

We are accepting string using character pointer. Now we are checking each character using character pointer and in each loop we are incrementing the character pointer.

while (*str != '\0') {
-------
-------
}

while (*str != '\0') {

-------

}

Whenever first space is encountered then number of space counter is incremented by one.

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

if (*str == ' ') {

pos = high; // counting number of blank spaces.

++nob;

} else if (pos == high) {

pos = low; // counting number of words.

++now;

}

In the if block we are checking that whether our pointer position is within the word or outside the word.

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