print.cpp

该代码是用来实现一些数字的基本运算

/*
    print.cpp - Read a file and print it to the screen.
 */
#include        <stdio.h>
#include        <string.h>

main(int argc, char *argv[])
{
char *ProgName;
FILE *fp;

    if ((ProgName = strrchr (argv[0], '\\')) != NULL ||
        (ProgName = strrchr (argv[0], '/')) != 0)
    {
        ++ProgName;
    }
    else
    {
        ProgName = argv[0];
    }
    if (argc < 2)
    {
        fprintf (stderr, "%s: Please enter a file name\n",
                          ProgName);
        return (-1);
    }
    if ((fp = fopen (argv[1], "rb")) == NULL)
    {
        fprintf (stderr, "%s: Cannot open %s\n", ProgName,
                          argv[1]);
        return (-1);
    }
    char Line[256];

ReadIn:
    if (fgets(Line, sizeof(Line), fp) != NULL)
    {
        fputs (Line, stdout);
        goto ReadIn;
    }
    if (!feof(fp))
    {
        fprintf (stderr, "%s: Error %d reading %s\n",
                 ProgName, ferror (fp), argv[1]);
    }
    fclose (fp);
    return (0);
}