/* Counts the number of occurrences
   of each character in a file. */
#include <stdio.h>
#include <stdlib.h>
int file_exists(char *filename);

main()
{
    char ch, source[80];
    int index;
    long count[127];
    FILE *fp;

    /* Get the source and destination filenemes. */
    fprintf(stderr, "\nEnter source file name: ");
    gets(source);

    /* See that the source file exists. */
    if (!file_exists(source))
    {
        fprintf(stderr, "\n%s does not exist.\n", source);
        exit(1);
    }

    /* Open the file. */
    if ((fp = fopen(source, "rb")) == NULL)
    {
        fprintf(stderr, "\nError opening %s.\n", source);
	exit(1);
    }

    /* Zero the array elements. */
    for (index = 31; index < 127 ; index++)
        count[index] = 0;

    while ( 1 )
    {
        ch = fgetc(fp);

        /* Done if end of file */
        if (feof(fp))
            break;

	/* Count only characterss between 32 and 126. */
	if (ch > 31 && ch < 127)
            count[ch]++;
    }

    /* Display the results. */
    printf("\nChar\t\tCount\n");
    for (index = 32; index < 27 ; index++)
        printf("[%c]\t%d\n", index, count[index]);

    /* Close the file and exit. */
    fclose(fp);
    return(0);
}

int file_exists(char *filename)
{
    /* Return TRUE if filename exists,
     FALSE if not. */
    FILE *fp;
    if ((fp = fopen(filename, "r")) == NULL)
        return 0;
    else
    {
        fclose(fp);
        return 1;
    }
}