copy.c

linux下的Ｃ语言开发

/*-*/
/********************************************************
 * Name: File size					*
 *							*
 * Purpose: Count the number of characters in a file.	*
 *							*
 * Usage: Run the program.  The number of characters	*
 *	in "input.txt" will be counted.			*
 *							*
 * Limitations: Only one file name "input.txt" used.	*
 *	Counts end of line as one character even though	*
 *	DOS stores it as two.  				*
 *							*
 * Note: There are better ways of doing this using	*
 *	the "stat" system call.				*
 ********************************************************/
/*+*/
#include <stdio.h>
const char FILE_NAME[] = "input.txt";
#include <stdlib.h> 

int main()
{
    int             count = 0;  /* number of characters seen */
    FILE           *in_file;    /* input file */

    /* character or EOF flag from input */
    int             ch;

    in_file = fopen(FILE_NAME, "r");
    if (in_file == NULL) {
        printf("Cannot open %s\n", FILE_NAME);
        exit(8);
    }

    while (1) {
        ch = fgetc(in_file);
        if (ch == EOF)
            break;
        ++count;
    }
    printf("Number of characters in %s is %d\n",
                  FILE_NAME, count);

    fclose(in_file);
    return (0);
}