C program to find the number of character, words and lines in a file

Write a C program to find the number of character, words and lines in a file.

  #include <stdio.h>
  #include <string.h>
  #define MAX 256
  #define INSIDE 1
  #define OUTSIDE 0

  int main() {
        FILE *fp;
        char filename[MAX];
        int word, line, chr, ch, pos = OUTSIDE;

        word = line = chr = 0;

        /* get the input file name from the user */
        printf ("Enter your input file name:");
        scanf("%s", filename);

        /* open the input file in read mode */
        fp = fopen(filename, "r");

        /* error handling */
        if (!fp) {
                printf("Unable to open input file!!\n");
                return 0;
        }

        /*
         * calculating the number of lines, characters
         * and word in the given input file
         */

        while ((ch = fgetc(fp)) != EOF) {

                /* no of characters */

                chr++;

                /* no of lines */

                if (ch == '\n') {

                        line++;

                }

                /* no of words maninpulation */

                if (ch == '\n' || ch == '\t' || ch == ' ') {

                        pos = OUTSIDE;

                } else if (pos == OUTSIDE) {

                        pos = INSIDE;

                        word++;

                }

        }

        /* printing the results */

        printf("No of lines: %d\n", line);

        printf("No of words: %d\n", word);

        printf("No of characters: %d\n", chr);

        /* closing the opened file */

        fclose(fp);

        return 0;

  }

  Output:

  jp@jp-VirtualBox:~/$ ./a.out
  Enter your input file name: library.txt
  No of lines: 4
  No of words: 16
  No of characters: 80

  jp@jp-VirtualBox:~/$ cat library.txt 
  1 Samuel 4 100.739998
  2 Raja 3 150.110001
  3 Gopi 5 175.190002
  5 Ram 1 50.150002

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