count character, line & word in the file using c program

Note:

•  For getchar should not use char datatype, because it may return EOF.
• The value for EOF is -1

Program:

#include <stdio.h>
#include <errno.h>

#define WORD_OUTSIDE 1   /* Word outside */
#define WORD_INSIDE  0   /* Word inside  */

int main(int argc, char *argv[])
{
        /* For getchar should not use char datatype, because it return EOF.
         * The value for EOF is . */
        int   ch = 0, nc = 0, nl = 0, nw = 0, word_in_out;
        FILE  *fp_input = NULL;

        if (argc <=1) {
                printf("Give file name in the command prompt while executing the commmand: \n\n");
                return 0;
        }

        fp_input = fopen(argv[1], "r");
        if (fp_input == NULL) {
                printf("Failed to open the file %d. \n\n", errno);

                perror("Error:");
                return 0;
        }

       word_in_out = WORD_OUTSIDE;
        while ((ch = fgetc(fp_input)) != EOF) {
                ++nc;
                if (ch == '\n') {
                        ++nl;
                }
                if ((ch == ' ') || (ch == '\n') || (ch == '\t')) {
                        word_in_out = WORD_OUTSIDE;
                } else if (word_in_out == WORD_OUTSIDE) {
                        ++nw;
                        word_in_out = WORD_INSIDE;
                }
        }

        printf("Total number of character = %d, Line = %d, word = %d \n",
                       nc, nl, nw);

        return 0;
}

Output:

velraj@velraj-HEC41:~/CProgram$ ./a.out new
Total number of character = 28, Line = 5, word = 7